🎛️ LX Lingxiao 56WUA400-II Spa Pump — 4.0 HP 2-Speed 230V 56-Frame 2″ × 2″ Side Discharge

Versatile dual-speed jet pump — powerful jets on high, quiet filtration on low — OEM for Sundance, Jacuzzi & Dimension One spas

♨️ Product Overview

The LX Lingxiao 56WUA400-II is a 4.0 HP brake torque (2.5 HP continuous duty) dual-speed, 56-frame jet pump drawing 12.0 amps on high speed and 4.4 amps on low speed at 230V/60Hz. Manufactured by Guangdong Lingxiao Pump Industry Co., Ltd. — one of the world’s largest OEM spa pump producers — this pump is factory-installed in Sundance, Jacuzzi, Dimension One, Clearwater, and other major spa brands. The dual-speed design provides powerful hydrotherapy jets at 3450 RPM on high speed and energy-efficient, whisper-quiet filtration at 1725 RPM on low speed, all in a single pump. The 56WUA400-II features 2″ MBT connections on both suction (center) and discharge (side), with the discharge rotatable in 90-degree increments for flexible plumbing alignment. Flow rate reaches up to 202 GPM with a maximum operating pressure of 0.3 MPa (~43.5 PSI). This pump comes equipped with mounting base/feet, two sets of 2″ pump unions, an instruction manual, and a wiring diagram. Cord is NOT included — reuse your existing cord or purchase separately. The 56WUA400-II is a direct replacement for the Sundance/Jacuzzi OEM pump 6500-367 (2-speed), a cost-effective alternative to the Gecko Aqua-Flo XP2e and Waterway Executive pumps, and can even serve as a replacement for the Energy Saver 430-0052. This pump can also be wired as a single-speed unit by connecting only the high-speed terminal. Backed by a 1-year manufacturer’s limited warranty. UL, cUL, and ETL certified.

⚠️ IMPORTANT — WITH BASE vs BRACKETLESS: This pump (56WUA400-II) comes WITH a welded-on mounting base/feet. If your spa uses a bracket-mounted pump (common on Sundance/Jacuzzi spas), you need the bracketless version 56WUA400-II(NF) plus the Sundance/Jacuzzi mounting bracket 6000-535 (sold separately). Verify your mounting style before ordering.

⭐ Key Features

✅ 4.0 HP Brake Torque / 2.5 HP Continuous Duty — Industry-standard dual HP rating; actual performance defined by the consistent 12.0A high-speed draw at 230V

✅ Dual-Speed Operation — High speed (12.0A / 3450 RPM) for powerful multi-jet hydrotherapy and low speed (4.4A / 1725 RPM) for quiet, energy-efficient filtration

✅ Can Also Function as Single-Speed — Wire only the high-speed terminal with a 3-wire cord to use as a 1-speed pump (equivalent to 56WUA400-I)

✅ Up to 202 GPM Flow Rate — High-volume water flow for powerful multi-jet hydrotherapy

✅ OEM Factory Pump for Sundance, Jacuzzi & Dimension One — Replaces 6500-367, 6500-352, 6500-363, 6500-365 and other original equipment numbers

✅ 56-Frame Motor (56Y) — Quieter Operation — Larger motor runs cooler and quieter than 48-frame alternatives, with anti-creep bearing for longer life

✅ 2″ MBT Suction AND 2″ MBT Discharge — Both ports sized at 2″ MBT (~3″ OD threads) for standard spa plumbing

✅ 4-Position Discharge Rotation — Wet end rotates in 90-degree increments (12, 3, 6, or 9 o’clock) for flexible plumbing alignment

✅ UL, cUL, and ETL Certified — Tested and certified for North American electrical safety standards

✅ Thermally Protected Motor — Built-in thermal overload protection with 80,000 capacitor charge-discharge cycle testing and thermal protector from Texas Instruments

✅ Unions Included — Two sets of 2″ pump unions come pre-packaged for easy installation

✅ Cost-Effective Replacement — Priced significantly below comparable Gecko Aqua-Flo XP2e and Waterway Executive pumps

✅ 1-Year Manufacturer’s Limited Warranty — Warranty directly with Guangdong Lingxiao Pump Industry Co., Ltd.

⚙️ Technical Specifications

Specification	Value
Manufacturer	Guangdong Lingxiao Pump Industry Co., Ltd. (LX)
Model / Series	56WUA / HydroMaster
Part Number	56WUA400-II
Pump Type	Jet Pump — Side Discharge
Horsepower (Brake Torque / BHP)	4.0 HP
Horsepower (Continuous Duty)	2.5 HP
Speed Settings	2-Speed (Dual Speed)
RPM	3450 (High) / 1725 (Low)
Voltage	220-240V (listed as 230V by most US retailers)
Frequency	60 Hz
Phase	Single Phase
High Speed Amperage	12.0 Amps
Low Speed Amperage	4.4 Amps
Maximum Flow Rate	202 GPM
Maximum Operating Pressure	0.3 MPa (~43.5 PSI)
Frame Type	56 Frame (56Y) Thru-Bolt
Discharge Type	Side Discharge
Discharge Size	2″ MBT (Male Buttress Thread) — ~3″ OD
Suction Size	2″ MBT (Male Buttress Thread) — ~3″ OD
Suction Style	Center
Discharge Rotation	4 positions — 90° increments (12, 3, 6, 9 o’clock)
Drain Plug Locations	3, 6, 9 o’clock positions
Mounting	With Base / Feet (welded on)
Dimensions (L × W × H)	16-7/16″ × 8-3/4″ × 8-7/8″
Seal Type	SEAL-56WUA (Ceramic/Graphite/Viton — LX OEM)
Impeller Part Number	IMP-56WUA400 (4.0 HP, 56 Frame)
Wet End Part Number	56WUA400-IIWE / WE-56WUA400II (4HP, 56FR, 2″ MBT, SD)
UPC	600358155454
Certifications	UL, cUL, ETL
Cord	NOT INCLUDED — reuse existing or purchase separately
Unions	INCLUDED (two sets of 2″ unions)
Included in Box	1 × pump, 1 × instruction manual, 1 × wiring diagram, 2 × 2″ unions
Warranty	1-Year Manufacturer’s Limited Warranty

⚡ Electrical Requirements

Electrical Spec	Requirement
Supply Voltage	220-240V (230V nominal)
Frequency	60 Hz
Phase	Single Phase
High Speed Amperage	12.0 A
Low Speed Amperage	4.4 A
Motor Speed	3450 / 1725 RPM
Cord Type Required	4-wire (2-speed) pump cord — NOT included
Certifications	UL, cUL, ETL

⚠️ IMPORTANT ELECTRICAL SAFETY:

All electrical installations must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and local building codes. This 230V pump must be connected to a supply circuit protected by a Ground-Fault Circuit Interrupter (GFCI). A dedicated circuit is required — do not share with other appliances. The motor must be bonded with no smaller than a No. 8 AWG solid copper conductor per the National Electrical Code. Always refer to the wiring diagram included with the pump. This is a dual-speed pump requiring a 4-wire cord for full 2-speed operation. To wire as single-speed only, connect only the high-speed terminal using a 3-wire cord.

⚠️ Wiring Note: Do NOT simply reconnect wires in the same positions as your old pump. Wire positions can change between pump models. Always follow the wiring diagram included with the new pump.

🔗 Compatibility Guide

Sundance / Jacuzzi / Dimension One OEM Compatibility

The 56WUA400-II is the factory OEM pump (or direct replacement) for the following spa models:

Sundance Spas (2-speed models):

• 2010+ Burlington, Camden, Certa, Chelsee, Hamilton, and many others
• 2008+ Cameo, Optima
• 2009+ Altamar, Majesta
• 1998-2005 Altamar, Austin, Bahia, Calypso, Cameo
• 880 Series
• J-245, J-280, J-270, J-355, J-365, J-375, J-400 Series, J-LX, J-LXL

Jacuzzi Spas:

• Models using 6500-367 or 6500-363 OEM pump

Dimension One Spas:

• April 2023+ Reflection Series (except Triad)
• Bay Series (mid 2023+)

Other Compatible Brands:

• Clearwater Spas, Divine Hot Tubs, and other brands using LX 56WUA400-II OEM pumps

Replaces These Pumps (Cross-Reference)

Original Pump	Notes
Gecko Aqua-Flo XP2e 4.0HP 56FR 2-Speed	Same frame, HP, speed — 56WUA400-II serves as lower-cost alternative
Waterway Executive 4.0HP 56FR 2-Speed (3721621-1D)	Direct replacement
Sundance/Jacuzzi Theramax 6500-367	Direct OEM replacement (2-speed)
Sundance 6500-352 (1-speed)	56WUA400-II can replace by wiring as single-speed
Energy Saver 430-0052	Direct replacement
Sundance 6500-901 / 6500-902 / 6500-903	Use 56WUA400-II(NF) + bracket 6000-535 for retrofit

WITH BASE vs BRACKETLESS — Which Version Do You Need?

Version	Part Number	Mounting	Best For
With Base (THIS PUMP)	56WUA400-II	Welded-on feet/base	Spas with flat mounting surface
Bracketless (No Feet)	56WUA400-II(NF) / 56WUA400-II-BL	Requires bracket (6000-535 sold separately)	Sundance/Jacuzzi/Dimension One bracket-mounted systems

💡 How to Determine Your Mounting Type: Look at your existing pump. If it sits on welded-on feet/base attached to the pump body, order the standard 56WUA400-II. If it’s held by a clamp-style bracket attached to the motor, order 56WUA400-II(NF) plus bracket 6000-535.

Single-Speed vs Dual-Speed — 56WUA400 Family

Model	Speed	Amperage	Cord Type	Best For
56WUA400-I	1-Speed	12.0A	3-wire	Dedicated jet pump (separate circ pump for filtration)
56WUA400-II (THIS PUMP)	2-Speed	12.0A / 4.4A	4-wire	Combined jet + filtration (high for jets, low for filtration)
56WUA400-2/6	2-Speed (2-Pole/6-Pole)	12.0A / 1.0A	4-wire	DIFFERENT low speed — verify spa pack compatibility

⚠️ CRITICAL: The 56WUA400-II (4.4A low speed) and 56WUA400-2/6 (1.0A low speed) are NOT the same pump. Always verify both high and low speed amperage ratings match your existing pump before ordering.

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📐 Alternate Part Numbers

Primary / Also Known As Designations

Part Number	Notes	Source
56WUA400-II	Standard version with base/feet	Parts4Tubs, all major retailers
56WUA400-II(NF)	Bracketless version (no feet) — requires bracket 6000-535	Pool-Spa-Supplies, Amazon, SpaCare
56WUA400-II-BL	Bracketless designation (same as NF)	SpaPartsExperts, SpaPartsOutpost.ca
WUA400-II	Abbreviated model designation	HotTubOutpost
10-56WUA400	Distributor code	Pool-Spa-Supplies
LX56WUA400II	Concatenated part number	Various
BX4117-S2	HydroMaster brand designation	SpaDepot, EasySpaParts
56WUA400-2/6	DIFFERENT PUMP — 2-Pole/6-Pole variant (1.0A low speed) — NOT interchangeable	HotTubPartsOfAmerica, EasySpaParts
15-973-5640	Cross-reference number	SpaGuts

Sundance / Jacuzzi / Dimension One OEM Cross-References

Part Number	Notes	Source
6500-367	Primary Sundance/Jacuzzi OEM (2-speed)	SpaAndPoolSource, SpaCare, Amazon
6500-367S	Sundance variant (2-speed)	SpaAndPoolStore
6500-352	Sundance/Jacuzzi OEM (1-speed — 56WUA400-II can replace by wiring as single-speed)	Pool-Spa-Supplies, SpaPartsExperts
6500-363	Sundance/Jacuzzi alternate OEM (2010+)	Pool-Spa-Supplies, EasySpaParts, Amazon
6500-365	Sundance/Jacuzzi alternate OEM	SpaPartsExperts, Amazon
6500-359	Sundance/Jacuzzi alternate OEM	Amazon (Lingxiao official listing)
6500-901	Older Sundance — use 56WUA400-II(NF) + bracket 6000-535 as replacement	SpaAndPoolSource
6500-902	Older Sundance — use 56WUA400-II(NF) + bracket 6000-535 as replacement	SpaAndPoolSource
6500-903	Older Sundance — use 56WUA400-II(NF) + bracket 6000-535 as replacement	SpaAndPoolSource
6500-924	Sundance cross-reference	SpaAndPoolSource
05225427-2	Gecko/Sundance cross-reference	SpaAndPoolSource
390618	OEM cross-reference	Pool-Spa-Supplies
SD6500363 / SD6500-363	Sundance distributor format	EasySpaParts

Other Pump Cross-References (Replacement For)

Part Number	Brand / Model	Notes
3721621-1D	Waterway Executive 56F, 4HP, 2SP, 230V	Direct replacement
430-0052	Energy Saver	Direct replacement

Replacement Pump Components (Individual Parts)

Component	Part Number	Notes	Source
Wet End (4HP, 56FR, 2″)	56WUA400-IIWE / WE-56WUA400II	Complete assembly — fits both 1-speed and 2-speed	HotTubOutpost, Pool-Spa-Supplies, EasySpaParts
Impeller (4.0 HP)	IMP-56WUA400	LX OEM 4HP impeller for 56 frame	HotTubOutpost, BathAndSpaParts, VoomiSupply
Shaft Seal	SEAL-56WUA	Ceramic/Graphite/Viton — fits 48 & 56 frame WUA pumps up to 4HP	HotTubOutpost, Pool-Spa-Supplies, Opentip
Shaft Seal (Alternate P/N)	SEAL-48WUA / SEAL-WP-LP / 1-05-0159	Same seal, different part numbers	Pool-Spa-Supplies, Opentip
Housing O-Ring	84017	Volute o-ring for 56WUA wet ends	HotTubOutpost
Pump Housing	84013	Housing volute (sold separately from cover)	HotTubOutpost
Faceplate Cover	84015	Includes threaded connections for drain plugs	HotTubOutpost
Mounting Bracket	6000-535	Sundance/Jacuzzi bracket — required for NF/BL versions	Pool-Spa-Supplies, SpaCare
Unions	0602-20	2″ unions with o-rings (available separately)	HotTubOutpost
Union O-Rings	6000-645	Sundance/Jacuzzi union o-ring gaskets	SpaAndPoolStore
Barb Adapter	672-4350	For 3/8″ hose connection	HotTubOutpost
Impeller (Sundance P/N)	6500-612 / SUN6500-612	Sundance designation — fits 1-speed and 2-speed	HotTubOutpost
Drain Plug (Sundance P/N)	6500-602 / SUN6500-602	Compatible with 6500-352, 6500-363, 6500-367, 6500-369	HotTubOutpost
Housing Screws (Sundance P/N)	6500-601 / SUN6500-601	Self-tapping, x8 required	HotTubOutpost
Bleeder Barb	See HotTubOutpost listing	Wing-nut style or flat-screwdriver style depending on version	HotTubPartsOfAmerica

Related Pumps in the 56WUA400 Family

Model	Speed	Amperage	Port Size	Mounting
56WUA400-I	1-Speed	12.0A	2″ × 2″	With base
56WUA400-I(NF)	1-Speed	12.0A	2″ × 2″	Bracketless
56WUA400-II (THIS PUMP)	2-Speed	12.0A / 4.4A	2″ × 2″	With base
56WUA400-II(NF)	2-Speed	12.0A / 4.4A	2″ × 2″	Bracketless
56WUA400-2/6	2-Speed (2P/6P)	12.0A / 1.0A	2″ × 2″	Varies — DIFFERENT low speed

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🛠️ Installation Requirements

Mounting

Requirement	Specification
Mounting Position	Horizontal — below water level (flooded suction)
Mounting Style	With base/feet (standard 56WUA400-II) — sits on flat surface
Base	Solid, level, vibration-dampening surface
Ventilation	Adequate clearance around motor for air cooling
Access	Sufficient clearance for maintenance, wet end rotation, and wiring

Plumbing

Connection	Size	Notes
Suction	2″ MBT (Center)	~3″ outside thread diameter
Discharge	2″ MBT (Side)	~3″ outside thread diameter
Unions	INCLUDED (two sets of 2″)	Use supplied unions for best seal

Installation Notes

⚠️ Flooded Suction Required: This pump must be installed at or below the water level of the spa for proper operation.

⚠️ Never Run Pump Dry: Always ensure the pump casing is filled with water before starting. Running dry causes immediate seal damage and motor overheating.

⚠️ Discharge Rotation: The discharge ships at the 12:00 position and can be rotated to 3:00 or 9:00 by rotating the wet end in 90-degree increments to match your existing plumbing alignment.

⚠️ Cord NOT Included: This pump ships without a power cord. Reuse your existing dual-speed (4-wire) pump cord or purchase separately. Always refer to the wiring diagram included with the pump. Do NOT simply reconnect wires in the same positions as your old pump — wire positions can change between models.

⚠️ Unions INCLUDED: Two sets of 2″ unions are included. The manufacturer recommends using the supplied unions for the best seal. Unions from different sources may have slight dimensional variations.

⚠️ Bonding Wire Required: The motor must be bonded with no smaller than a No. 8 AWG solid copper conductor per the National Electrical Code (NEC).

⚠️ GFCI Protection Required: All spa and hot tub installations require GFCI protection per the NEC.

⚠️ Retrofitting Older Sundance/Jacuzzi Pumps: If replacing 6500-901, 6500-902, or 6500-903, some modifications may be needed. Use the bracketless version 56WUA400-II(NF) with bracket 6000-535 for best fit.

⚠️ Motor Serial Number: Keep a record of the motor serial number label on the outside of the motor (next to the red arrow). This is required for all warranty claims.

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🔧 Maintenance Guide

Routine Maintenance

Task	Frequency	Notes
Check for leaks	Monthly	Inspect around seal area, unions, and volute housing
Inspect plumbing connections	Monthly	Check union gaskets and o-rings for tight seal
Verify both speeds function	Monthly	Low speed should be noticeably quieter than high
Check amperage draw	Annually	High: ~12.0A, Low: ~4.4A at 230V
Keep motor clean	Quarterly	Ensure all air openings are free from debris
Verify GFCI operation	Monthly	Press test button to confirm proper function
Inspect mounting base/feet	Quarterly	Verify bolts remain tight and base is secure
Check drain plug(s)	Quarterly	Verify tight seal at 3, 6, or 9 o’clock positions

Warning Signs — Replace Pump If:

• Unusual noise (grinding, screeching, or humming without rotation)
• Water leaking from the seal area between motor and wet end
• Motor repeatedly trips the circuit breaker or GFCI
• Noticeably reduced water flow or weak jets
• Motor overheating or burning smell
• Motor hums but won’t start (possible capacitor failure)
• One speed works but the other does not (possible winding failure)
• Excessive vibration even on solid mounting
• Amperage draw significantly higher or lower than rated values

Seal Information

Detail	Specification
Seal Part Number	SEAL-56WUA
Also Known As	SEAL-48WUA, SEAL-WP-LP, 1-05-0159
Seal Type	Ceramic/Graphite/Viton
Compatibility	Fits all 48WUA and 56WUA series LX pumps (up to 4HP)

⚠️ Replace seal at first sign of leakage from between the motor and wet end. Consider replacing the complete wet end (56WUA400-IIWE) instead of just the seal — it comes pre-assembled with impeller, seal, diffuser, and volute housing.

⚠️ Important Seal Note: The LX WUA pump seal (SEAL-56WUA) is NOT the same as the Gecko Aqua-Flo PS-200 or the Sundance/Jacuzzi Theramax seal. Verify your wet end brand before ordering — the seal must match the wet end manufacturer, not the spa brand.

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🎯 Ideal Applications

Application	Suitability	Notes
♨️ Sundance/Jacuzzi spa jet pump (6500-367 replacement)	✅ Yes — Primary application	Direct OEM replacement for 2-speed models
♨️ Dimension One Reflection/Bay series (2023+)	✅ Yes	Factory OEM for April 2023+ models (except Triad)
♨️ Hot tub needing combined jet + filtration pump	✅ Yes	High speed for jets, low speed for quiet filtration
♨️ Replacement for Waterway Executive 56F 4HP 2-speed	✅ Yes	Cross-references 3721621-1D
♨️ Replacement for Gecko Aqua-Flo XP2e 56F 4HP 2-speed	✅ Yes	Cost-effective alternative with comparable amperage
♨️ Replacement for Energy Saver 430-0052	✅ Yes	Direct replacement
♨️ Spas with 2-1/2″ plumbing	❌ No	Port size mismatch — need larger port version
♨️ 115V spa installations	❌ No	This is a 230V pump only
🛁 Whirlpool bath	❌ No	Far too powerful for bath applications

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❓ Frequently Asked Questions

Q: Is this a 4.0 HP or 2.5 HP pump? A: Both ratings describe the same pump. 4.0 HP is the brake torque horsepower (BHP) — the aftermarket rating. 2.5 HP is the continuous duty rating — the rating on original Sundance/Jacuzzi OEM labels (6500-367). The 12.0A high-speed amperage draw is the most reliable specification for replacement matching.

Q: Will this replace my Sundance pump 6500-367? A: Yes. The 56WUA400-II is the direct replacement for the Sundance/Jacuzzi OEM 2-speed pump 6500-367. If your spa uses a bracket-mounted pump, order the bracketless version 56WUA400-II(NF) plus bracket 6000-535.

Q: What is the difference between the 56WUA400-I and 56WUA400-II? A: The 56WUA400-I is single-speed (12.0A only, 3-wire cord). The 56WUA400-II is dual-speed (12.0A high / 4.4A low, 4-wire cord). If your spa uses one pump for both jets and filtration (common in Sundance/Jacuzzi), you need the 56WUA400-II.

Q: Can I use this 2-speed pump as a single-speed? A: Yes. Connect only the high-speed terminal and leave the low-speed terminal unconnected, using a 3-wire (1-speed) cord instead of a 4-wire cord. This gives you equivalent performance to the 56WUA400-I.

Q: What is the 56WUA400-2/6 and is it the same pump? A: No. The 56WUA400-2/6 is a different variant with a 2-Pole/6-Pole motor configuration. Its low speed draws only 1.0A compared to this pump’s 4.4A. They are NOT interchangeable — always verify both high and low speed amperage match your spa pack requirements.

Q: What is the difference between the standard and NF (bracketless) version? A: The standard 56WUA400-II has a welded-on mounting base with feet. The 56WUA400-II(NF) has no base and requires a clamp-style mounting bracket (Sundance/Jacuzzi part 6000-535). Both have identical pump performance.

Q: Are pump unions included? A: Yes. Two sets of 2″ unions are included. The manufacturer recommends using the supplied unions for the best seal.

Q: Is a cord included? A: No. This pump ships without a power cord. Reuse your existing dual-speed (4-wire) pump cord or purchase separately. The wiring diagram is included. Do NOT reuse wiring positions from your old pump — follow the new diagram.

Q: Can I rotate the discharge direction? A: Yes. The discharge ships at the 12:00 position and can be rotated to 3:00 or 9:00 (90-degree increments) by rotating the wet end.

Q: What seal does this pump use? A: The OEM LX seal is SEAL-56WUA (also known as SEAL-48WUA, SEAL-WP-LP, 1-05-0159). It is a Ceramic/Graphite/Viton type. This seal is NOT the same as Gecko Aqua-Flo PS-200 — make sure you match the seal to the wet end brand.

Q: What impeller does this pump use? A: IMP-56WUA400 — the 4.0 HP impeller for LX 56-frame WUA pumps. Sundance designation is 6500-612 / SUN6500-612. The impeller fits both the single-speed (-I) and dual-speed (-II) versions.

Q: How does this compare to the Gecko Aqua-Flo XP2e? A: The 56WUA400-II draws 12.0A/4.4A at 230V, while the comparable Gecko XP2e (05340009-5040) draws 15.0A/4.5-4.8A. Despite both being marketed as 4.0 HP, the XP2e is a more powerful pump by amperage. The LX is a cost-effective alternative suitable for spas originally equipped with LX/12A pumps.

Q: How do I know what frame size my pump is? A: Measure the distance between consecutive (not diagonal) motor through bolts. Approximately 4 inches apart = 56-frame. Approximately 3-1/2 inches apart = 48-frame.

Q: What are the port sizes? A: Both suction and discharge are 2″ MBT (Male Buttress Thread), measuring approximately 3″ across the outside of the threads (~3-1/16″ per Gecko/Aqua-Flo measurements). If your pump threads measure approximately 3-1/2″ across, you have 2-1/2″ plumbing and need a different pump.

Q: Do I need a GFCI breaker? A: Yes, GFCI protection is required by the National Electrical Code (NEC) for all hot tub and spa installations.

Q: What warranty is included? A: 1-year manufacturer’s limited warranty — repair or replace (no refunds). Warranty does not include shipping costs. Warranty is directly with the manufacturer. The motor serial number label (on the outside of the motor, next to the red arrow) is required for all warranty claims.

🏆 Why Choose the LX Lingxiao 56WUA400-II

✅ Dual-Speed Versatility — One pump handles both powerful jet hydrotherapy (high speed) and quiet filtration (low speed)

✅ Direct OEM Replacement — Factory-installed in Sundance, Jacuzzi, Dimension One, Clearwater, and other major brands

✅ Significant Cost Savings — Priced well below comparable Gecko Aqua-Flo XP2e and Waterway Executive pumps

✅ Consistent Amperage — No Variance — 12.0A/4.4A confirmed identically across every source

✅ UL, cUL, and ETL Certified — Full North American safety certifications

✅ 202 GPM Maximum Flow — High-volume water movement for powerful multi-jet hydrotherapy

✅ Can Also Function as Single-Speed — Wire high-speed only with a 3-wire cord for single-speed operation

✅ Unions Included — Ready to install with pre-packaged 2″ union assemblies and wiring diagram

✅ Proven Customer Satisfaction — Reviews confirm “exact replacement,” “direct replacement,” “plug and play,” “installed in 5 minutes,” and “works perfect”

✅ Extensive OEM Cross-Reference — Replaces 6500-367, 6500-352, 6500-363, 6500-365, 3721621-1D, 430-0052, and many more

🤝 Why Buy From Parts4Tubs

✅ US-based support for American customers

✅ Fast shipping across the United States

✅ Expert advice from spa and hot tub specialists

✅ Competitive pricing

✅ Full warranty support

✅ Hassle-free returns

✅ Compatible pump cords, seals, wet ends, and replacement parts available

✅ Dedicated customer service team

✨ Summary

The LX Lingxiao 56WUA400-II is a 4.0 HP brake torque (2.5 HP continuous duty) dual-speed, 230V/60Hz jet pump drawing 12.0 amps on high speed and 4.4 amps on low speed with a 56-frame (56Y) thru-bolt motor at 3450/1725 RPM. This OEM factory pump features 2″ MBT suction (center) and 2″ MBT side discharge (~3″ OD each), with 4-position discharge rotation. Maximum flow rate 202 GPM, maximum operating pressure 0.3 MPa (~43.5 PSI). Dimensions: 16-7/16″ × 8-3/4″ × 8-7/8″. Direct replacement for Sundance/Jacuzzi 6500-367 (2-speed), 6500-352, 6500-363, 6500-365, 6500-359, Waterway 3721621-1D, and Energy Saver 430-0052. Also used in Dimension One Reflection/Bay Series (April 2023+). LX OEM seal (SEAL-56WUA), 4HP impeller (IMP-56WUA400), wet end (56WUA400-IIWE). Mounting base/feet INCLUDED. Unions INCLUDED (two sets of 2″). Cord NOT included. Can be wired as single-speed by connecting only high-speed terminal. Available in bracketless version as 56WUA400-II(NF) for Sundance/Jacuzzi bracket-mounted installations (bracket 6000-535 sold separately). UL, cUL, and ETL certified. Manufactured by Guangdong Lingxiao Pump Industry Co., Ltd. 1-year manufacturer’s limited warranty. Available now at Parts4Tubs with fast US shipping and expert compatibility support.

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	Magic Plastics Union 0602-15 (1.5″ Pump Union) | 1-1/2″S x 1-1/2″FBT Union, Pump, Magic, 1-1/2"S x 1-1/2"FBT (Industry Standard) w/ O-Ring	$6.36 Max: 575 Min: 1 Step: 1 Add to cart
	Magic Plastics Union 0602-20 (2″ Pump Union) | 2″S x 2″FBT w/ O-Ring Union, Pump, Magic, 2"S x 2"FBT (Industry Standard) w/ O-Ring	$8.00 Max: 491 Min: 1 Step: 1 Add to cart
	Waterway Union 400-6010 | 2-1/2″ Union Nut with 2-1/2″ Slip tailpiece and o-ring (2.5″ union) Union, Pump, Waterway, 2-1/2"FBT x 2-1/2"S	$14.77 Max: 145 Min: 1 Step: 1 Add to cart
	1 Speed Pump / Blower / AMP Cord | 21086 Amp Plug, Pump, 1-Speed, 14/3, 4-Pin, 5' Cord, White	$24.71 Max: 426 Min: 1 Step: 1 Add to cart
	Balboa Amp Plug 21087 (For 2 Speed Pumps) Amp Plug, Pump 1 (2-Speed) 14/4, 72" Long, White	$31.72 Max: 176 Min: 1 Step: 1 Add to cart

Hot Tub Pump Collar & Union Size Chart

Imperial & Metric Specifications

Union Size	Collar Size	Thread OD	Union OD	O-Ring Size
1.5" Female Buttress Thread (FBT)	2.5" / 64mm (Tip to Tip) Measurement	2-1/2" 64mm	2-13/16" 71mm	2-5/16" OD 59mm
2" Female Buttress Thread (FBT)	3.1" / 78mm (Tip to Tip) Measurement	3-1/16" 78mm	3-3/8" 81mm	2-15/16" OD 75mm
2.5" Female Buttress Thread (FBT)	3.6" / 91mm (Tip to Tip) Measurement	3-5/8" 91mm	4-1/4" 108mm	3-7/16" OD 87mm

Important Notes

The union "size" (1.5", 2", 2.5") is nominal and doesn't correspond to any actual measurement.

Collar size is measured from thread tip to thread tip on the pump outlet.

Most hot tub pumps use Female Buttress Thread (FBT) - 98% of applications.

O-ring gaskets may vary between manufacturers - measure your existing gasket for accuracy.

How do I Replace a Hot Tub Pump?

Here's a general step-by-step guide on how to replace a hot tub pump. Keep in mind that the specific steps may vary depending on your hot tub's make and model, so it's essential to consult your hot tub's manual for model-specific instructions. If you're not comfortable with this procedure, it's a good idea to seek professional assistance.

Materials You'll Need:

• Replacement pump
• Pipe wrench
• Adjustable wrench
• Screwdriver
• Pipe sealant (thread tape or plumber's putty)
• PVC primer and cement (if you have PVC plumbing)
• Teflon tape (for threaded connections)

Procedure:

1. Turn Off the Power: Before you begin, ensure the hot tub's power supply is turned off at the circuit breaker or disconnect switch. Safety should always be a priority when working with electrical components.

2. Drain the Hot Tub: If your hot tub is not already empty, you'll need to drain it. Follow your hot tub's manual or manufacturer's instructions for proper draining. (You might not need to do this if you can lock the pump off with the gate valves)

3. Locate the Pump: Identify the location of the existing pump in your hot tub. It's usually located near the equipment area or in a designated pump compartment.

4. Disconnect the Electrical Wiring: Carefully disconnect the electrical wiring from the old pump. This typically involves removing the electrical conduit cover, unscrewing wire nuts, and disconnecting the wires from the terminals. Be sure to note the wire connections or take a picture for reference when connecting the new pump.

5. Disconnect the Plumbing: Depending on your hot tub's plumbing setup, you'll need to disconnect the plumbing connections to the pump. Use a pipe wrench or adjustable wrench to loosen and remove the fittings. Be prepared for some water spillage when disconnecting the plumbing.

6. Remove the Old Pump: Once the electrical and plumbing connections are detached, carefully remove the old pump from its mounting position. Some pumps may be secured with mounting brackets or bolts.

7. Prepare the New Pump: If the new pump is not pre-assembled, you may need to attach fittings, unions, or adapters to match your hot tub's plumbing. Ensure that you use the appropriate sealant or Teflon tape on threaded connections to prevent leaks.

8. Mount the New Pump: Position the new pump in the same location as the old one and secure it in place using the mounting brackets or bolts.

9. Reconnect Plumbing: Reconnect the plumbing to the new pump, ensuring that all connections are tight and secure. If your hot tub uses PVC plumbing, use PVC primer and cement to bond the connections properly.

10. Reconnect Electrical Wiring: Reconnect the electrical wiring to the new pump, following the notes or pictures you took earlier. Make sure all wires are properly connected and secure.

11. Turn On the Power: Restore power to the hot tub by switching on the circuit breaker or reconnecting the disconnect switch.

12. Test the Pump: Turn on the hot tub's pump to ensure that it's working correctly. Check for any signs of leaks or irregularities in the plumbing connections.

13. Refill the Hot Tub: Once you've confirmed that the new pump is functioning properly, refill the hot tub with water.

14. Check for Leaks: Inspect the plumbing connections for any leaks. If you find any, turn off the pump, drain the tub again, and reseal the connections as needed.

15. Monitor: Keep an eye on the pump and plumbing for the next few days to ensure everything is functioning correctly and that there are no further issues.

Remember that this is a general guideline, and the specific steps may vary based on your hot tub's design. If you're unsure or uncomfortable with any aspect of this process, please do get in touch, happy to help.

How do I know what size hot tub pump I have?

Determining the size of your hot tub pump is an important step when it comes to maintenance or replacement. To find out the size of your hot tub pump, follow these steps:

1. Check the Manual: The easiest way to determine the size of your hot tub pump is to consult the owner's manual or user documentation that came with your hot tub. The manual typically contains detailed information about the specifications and components of your hot tub, including the pump.

2. Look at the Pump Housing: If you don't have access to the manual or it doesn't provide the information you need, inspect the pump itself. Most hot tub pumps have a label or plate on the pump housing that displays essential details, including the pump's model number, manufacturer, and specifications. You can then send that to me or Google it.

3. Measure the Pump: If the label is missing or damaged, you can measure the pump's dimensions. Measure the diameter of the pump's wet end (the part where the water flows) and the length of the wet end. These measurements can help identify the size and capacity of the pump.

4. Consult the Manufacturer: If you can't find the information on the pump or in the manual, contact the hot tub manufacturer or a reputable dealer. Provide them with your hot tub's model and serial number, and they should be able to identify the correct pump size for your specific hot tub.

5. Online Research: You can also search online using the pump's model number or hot tub's make and model. Many manufacturers provide detailed information about their products on their websites, and you may find specifications for your pump model.

Once you have determined the size and specifications of your hot tub pump, you can proceed with maintenance, repairs, or replacement if necessary. Keep in mind that replacing a hot tub pump with the same size and capacity as the original is crucial to ensure proper water circulation and filtration in your hot tub. If you're unsure about any aspect of this process, get in touch, always happy to help.