🔋 LX Lingxiao 56WUA400-I Spa Pump — 4.0 HP 1-Speed 230V 56-Frame 2″ × 2″ Side Discharge
Energy-efficient single-speed jet pump — direct OEM replacement for Sundance and Jacuzzi spas
📋 Product Overview
The LX Lingxiao 56WUA400-I is a 4.0 HP brake torque (2.5 HP continuous duty) single-speed, 56-frame jet pump drawing 12.0 amps at 230V/60Hz. Manufactured by Guangdong Lingxiao Pump Industry Co., Ltd. — one of the world’s largest OEM spa pump producers — this pump is used as a factory-installed component in Sundance, Jacuzzi, Clearwater, Divine, and other major spa brands. The 56WUA400-I 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-I is a direct replacement for the Sundance/Jacuzzi OEM pump 6500-352 and is compatible with many 2007+ J-Series models. This is the single-speed version of the popular 56WUA400 family — the dual-speed version is 56WUA400-II (12.0A/4.4A). The 56WUA400-I also serves as a cost-effective alternative to the Gecko Aqua-Flo XP2e 4.0 HP 56-frame single-speed pumps. Backed by a 1-year manufacturer’s limited warranty.
⚠️ IMPORTANT — WITH BASE vs BRACKETLESS: This pump (56WUA400-I) 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-I(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 draw at 230V
✅ 12.0 Amps — Consistent Across All Sources — No amperage variance between retailers; reliable specification for circuit sizing and replacement matching
✅ Up to 202 GPM Flow Rate — High-volume water flow for powerful multi-jet hydrotherapy
✅ OEM Factory Pump for Sundance & Jacuzzi — Replaces 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
✅ Mounting Base/Feet Included — Ships with welded-on base; bracketless version (NF) also available for bracket-mounted installations
✅ Unions Included — Two sets of 2″ pump unions come pre-packaged for easy installation
✅ Thermally Protected Motor — Built-in thermal overload protection prevents motor damage from overheating
✅ 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-I |
| Pump Type | Jet Pump — Side Discharge |
| Horsepower (Brake Torque / BHP) | 4.0 HP |
| Horsepower (Continuous Duty) | 2.5 HP |
| Speed Settings | 1-Speed (Single Speed) |
| RPM | 3450 |
| Voltage | 220-240V (listed as 230V by most US retailers) |
| Frequency | 60 Hz |
| Phase | Single Phase |
| Amperage | 12.0 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 |
| 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 |
| Amperage | 12.0 A |
| Motor Speed | 3450 RPM |
| Cord | NOT INCLUDED — reuse existing or purchase new 3-wire (1-speed) cord |
⚠️ 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 single-speed pump requiring a 3-wire cord — do NOT use a 4-wire (2-speed) cord.
🔗 Compatibility Guide
Sundance / Jacuzzi OEM Compatibility
The 56WUA400-I is the factory OEM pump (or direct replacement) for the following Sundance and Jacuzzi spa models:
Sundance Spas (2007+ models with 56-frame LX pump):
- 2007+ J-400 Series (replaces previous fixed pump 6500-902)
- All years J-LX
- All years J-LXL
- 2010+ J-375
- 2010+ J-365
- 2010+ J-355
- 2010+ J-280
- 2010+ J-270
- 880 Series
- 2008+ Cameo, Optima (2 each)
- 2009+ Altamar, Majesta (2 each)
- 2009+ Capri
- 2010+ Burlington, Camden, Certa, Chelsee, Hamilton, and others
Other Compatible Brands:
- Clearwater Spas
- Divine Hot Tubs
- Other brands using LX 56WUA400-I / 6500-352 OEM pumps
Replaces These Pumps (Cross-Reference)
| Original Pump | Notes |
|---|---|
| Gecko Aqua-Flo XP2e 4.0HP 56FR 1-Speed | Same frame, HP, speed — 56WUA400-I serves as lower-cost alternative |
| Waterway Executive 4.0HP 56FR 1-Speed (3711621-1D) | Same specifications — direct replacement |
| Sundance/Jacuzzi Theramax 6500-352 | Direct OEM replacement |
| Sundance 6500-901 / 6500-902 / 6500-903 | Use 56WUA400-I(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-I | Welded-on feet/base | Spas with flat mounting surface |
| Bracketless (No Feet) | 56WUA400-I(NF) | Requires bracket (6000-535 sold separately) | Sundance/Jacuzzi 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-I. If it’s held by a clamp-style bracket attached to the motor, order 56WUA400-I(NF) plus bracket 6000-535.
Single-Speed vs Dual-Speed — 56WUA400 Family
| Model | Speed | Amperage | Best For |
|---|---|---|---|
| 56WUA400-I (THIS PUMP) | 1-Speed | 12.0A | Dedicated jet pump (separate circ pump handles filtration) |
| 56WUA400-II | 2-Speed | 12.0A / 4.4A | Combined jet + filtration (low speed for filtration) |
💡 The 2-speed 56WUA400-II can also function as a 1-speed pump by connecting only the high-speed terminal and leaving low speed unconnected (using a 3-wire cord instead of 4-wire).
📐 Alternate Part Numbers
Primary / Also Known As Designations
| Part Number | Notes | Source |
|---|---|---|
| 56WUA400-I | Standard version with base/feet | Parts4Tubs, all major retailers |
| 56WUA400-I(NF) | Bracketless version (no feet) — requires bracket 6000-535 | Pool-Spa-Supplies, Amazon |
| 56WUA400-I-BL | Bracketless designation (same as NF) | HotTubOutpost |
| WUA400-I / wua400-1 | Abbreviated model designation | HotTubOutpost, SpaPumpsAndMore |
| 10-56WUA400 | Distributor code | Pool-Spa-Supplies |
| LX56WUA400I | Concatenated part number | Various |
| BX4117-S2 | HydroMaster brand designation | SpaDepot, EasySpaParts |
| 15-973-5640 | Cross-reference number | SpaGuts |
Sundance / Jacuzzi OEM Cross-References
| Part Number | Notes | Source |
|---|---|---|
| 6500-352 | Primary Sundance/Jacuzzi OEM (1-speed, bracketless) | Pool-Spa-Supplies, SpaCare, SpaDepot, Amazon |
| 6500-352S | Sundance variant | SpaAndPoolStore |
| 6500-363 | Sundance/Jacuzzi alternate OEM (2010+) | Pool-Spa-Supplies, EasySpaParts |
| 6500-365 | Sundance/Jacuzzi alternate OEM | Amazon, Pool-Spa-Supplies, SpaPumpsAndMore |
| 6500-367 | Sundance/Jacuzzi OEM (2-speed version — use 56WUA400-II) | HotTubOutpost, EasySpaParts |
| 6500-901 | Older Sundance — use 6500-352(NF) + bracket 6000-535 as replacement | SpaAndPoolSource |
| 6500-902 | Older Sundance — use 6500-352(NF) + bracket 6000-535 as replacement | SpaAndPoolSource |
| 6500-903 | Older Sundance — use 6500-352(NF) + bracket 6000-535 as replacement | SpaAndPoolSource |
| 6500-924 | Sundance cross-reference | SpaAndPoolSource |
| 05225427-2 | Gecko/Sundance cross-reference | SpaAndPoolSource |
| 05225980-2 | Gecko/Sundance cross-reference | SpaPumpsAndMore |
| 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 |
|---|---|---|
| 3711621-1D | Waterway Executive 56F, 4HP, 1SP, 230V | Direct replacement |
| 430-0052 | Energy Saver | 2-speed version (56WUA400-II) replaces this |
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 | 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 |
| 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 |
| 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 |
Related Pumps in the 56WUA400 Family
| Model | Speed | Amperage | Port Size | Mounting |
|---|---|---|---|---|
| 56WUA400-I (THIS PUMP) | 1-Speed | 12.0A | 2″ × 2″ | With base |
| 56WUA400-I(NF) | 1-Speed | 12.0A | 2″ × 2″ | Bracketless |
| 56WUA400-II | 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 (2-Pole/6-Pole) | 12.0A / 1.0A | 2″ × 2″ | Varies |
⚠️ NOTE: The 56WUA400-2/6 (2-pole/6-pole) has a different low speed amperage (1.0A) compared to the standard 56WUA400-II (4.4A). These are NOT interchangeable without verifying your spa pack compatibility.
🛠️ Installation Requirements
Mounting
| Requirement | Specification |
|---|---|
| Mounting Position | Horizontal — below water level (flooded suction) |
| Mounting Style | With base/feet (standard 56WUA400-I) — sits on flat surface |
| Base | Solid, level, vibration-dampening surface |
| Ventilation | Adequate clearance around motor for air cooling |
| Access | Sufficient clearance for maintenance and wet end rotation |
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. The wet end can be rotated in 90-degree increments to match your existing plumbing alignment.
⚠️ Cord NOT Included: This pump ships without a power cord. Reuse your existing single-speed (3-wire) pump cord or purchase separately. Always refer to the wiring diagram included with the pump.
⚠️ 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 National Electrical Code (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-I(NF) with bracket 6000-535 for best fit.
🔧 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 |
| Check amperage draw | Annually | Should be approximately 12.0A 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)
- Excessive vibration even on solid mounting
- Amperage draw significantly higher or lower than 12.0A
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 a new impeller, seal, diffuser, and volute housing.
⚠️ Important Seal Note: The LX WUA pump seal (SEAL-56WUA) is NOT the same as the Sundance/Jacuzzi pump seal found in some Theramax models. Verify your wet end brand before ordering — the seal must match the wet end manufacturer, not the spa brand.
🎯 Ideal Applications
| Application | Suitability | Notes |
|---|---|---|
| ♨️ Sundance/Jacuzzi spa jet pump (6500-352 replacement) | ✅ Yes — Primary application | Direct OEM replacement for 2007+ J-Series and other models |
| ♨️ Hot tub jet pump with 2″ plumbing, 12A, 230V | ✅ Yes | Matches any spa requiring 4HP/12A/230V/56-frame/2″/1-speed |
| ♨️ Replacement for Waterway Executive 56F 4HP 1-speed | ✅ Yes | Cross-references 3711621-1D |
| ♨️ Replacement for Gecko Aqua-Flo XP2e 56F 4HP 1-speed | ✅ Yes | Cost-effective alternative with comparable performance |
| ♨️ Spas with 2-1/2″ plumbing | ❌ No | Port size mismatch — use 56WUA500-I (2.5″ × 2.5″) instead |
| ♨️ 115V spa installations | ❌ No | This is a 230V pump only |
| 🛁 Whirlpool bath | ❌ No | Far too powerful for bath applications |
❓ 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 marketing rating used in aftermarket listings. 2.5 HP is the continuous duty rating — the rating used on original Sundance/Jacuzzi OEM labels (6500-352). Amazon’s Lingxiao official listing confirms both: “4.0 horsepower spa pump, Output power: 2.5HP.” The 12.0A amperage draw is the most reliable specification for replacement matching.
Q: Will this replace my Sundance pump 6500-352? A: Yes. The 56WUA400-I is the direct replacement for the Sundance/Jacuzzi OEM pump 6500-352. If your spa uses a bracket-mounted pump, order the bracketless version 56WUA400-I(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). The 56WUA400-II is dual-speed (12.0A high / 4.4A low). If your spa uses a 2-speed pump for both jet operation and filtration, you need the 56WUA400-II.
Q: What is the difference between the standard and NF (bracketless) version? A: The standard 56WUA400-I has a welded-on mounting base with feet. The 56WUA400-I(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 single-speed (3-wire) pump cord or purchase separately. The wiring diagram is included with the pump.
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 or Sundance Theramax seals — 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. The impeller fits both the single-speed (56WUA400-I) and dual-speed (56WUA400-II) versions.
Q: How does this compare to the Gecko Aqua-Flo XP2e? A: The 56WUA400-I draws 12.0A at 230V, while the comparable Gecko XP2e (05340009-5040) draws 15.0A. Despite both being marketed as 4.0 HP, the XP2e is actually a more powerful pump. The LX is a cost-effective alternative suitable for spas originally equipped with LX/12A pumps.
Q: Can I use this to replace a 6500-901, 6500-902, or 6500-903? A: Yes, but modifications may be needed. Use the bracketless version 56WUA400-I(NF) with bracket 6000-535. The 6500-901/902/903 were older-style pumps — some plumbing or mounting adjustments may be required for retrofit.
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. The 56WUA400-I is a 56-frame pump only.
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. 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 (Guangdong Lingxiao Pump Industry Co., Ltd.).
🏆 Why Choose the LX Lingxiao 56WUA400-I
✅ Direct OEM Replacement — Factory-installed in Sundance, Jacuzzi, Clearwater, and other major brands
✅ Significant Cost Savings — Priced well below comparable Gecko Aqua-Flo XP2e and Waterway Executive pumps
✅ Consistent 12.0A Amperage — No specification variance across any source — reliable and predictable performance
✅ 202 GPM Maximum Flow — High-volume water movement for powerful multi-jet hydrotherapy
✅ Unions Included — Ready to install with pre-packaged 2″ union assemblies and wiring diagram
✅ Proven Reliability — OEM status in major spa brands confirms manufacturing quality and durability
✅ Serviceable Components — Individual parts (wet end, seal, impeller) readily available for cost-effective repairs
✅ Anti-Creep Bearing — Motor bearing technology for longer, quieter operation
✅ Flexible Mounting Options — Available in both base-mount (56WUA400-I) and bracketless (56WUA400-I(NF)) versions
✅ Extensive OEM Cross-Reference — Replaces 6500-352, 6500-363, 6500-365, 3711621-1D, 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-I is a 4.0 HP brake torque (2.5 HP continuous duty) single-speed, 230V/60Hz jet pump drawing 12.0 amps with a 56-frame (56Y) thru-bolt motor at 3450 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 6500-352, 6500-363, 6500-365, Waterway 3711621-1D, and comparable to Gecko Aqua-Flo XP2e 4.0HP single-speed pumps. 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. Available in bracketless version as 56WUA400-I(NF) for Sundance/Jacuzzi bracket-mounted installations (bracket 6000-535 sold separately). 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.
Union, Pump, Magic, 1-1/2"S x 1-1/2"FBT (Industry Standard) w/ O-Ring | ||
Union, Pump, Magic, 2"S x 2"FBT (Industry Standard) w/ O-Ring | ||
Union, Pump, Waterway, 2-1/2"FBT x 2-1/2"S | ||
Amp Plug, Pump, 1-Speed, 14/3, 4-Pin, 5' Cord, White | ||
Amp Plug, Pump 1 (2-Speed) 14/4, 72" Long, White |
Hot Tub Pump Collar & Union Size Chart
| 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
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:
-
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.
-
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)
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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Turn On the Power: Restore power to the hot tub by switching on the circuit breaker or reconnecting the disconnect switch.
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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.
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Refill the Hot Tub: Once you've confirmed that the new pump is functioning properly, refill the hot tub with water.
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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.
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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:
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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.
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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.
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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.
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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.
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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.




















