🔧 LX Lingxiao 56WUA400-I (NF) Spa Pump – 2.5 HP 1-Speed 230V 56 Frame

Reliable single-speed jet power built for Sundance and Jacuzzi spa systems

💧 Product Overview

The LX Lingxiao 56WUA400-I (NF) is a powerful single-speed jet pump engineered for hot tub and spa applications across North America. Manufactured by Guangdong Lingxiao Pump Industry Co., Ltd. (LX), one of the industry’s most established spa pump producers, the WUA series delivers consistent high-performance water circulation through a robust 56-frame thru-bolt motor design.

Rated at 2.5 HP continuous duty (4.0 HP brake-torque horsepower), this pump operates at 230V/60Hz and draws 12.0 amps, making it a direct replacement for Sundance and Jacuzzi OEM pumps including the widely used 6500-352 and 6500-365 models. The baseless (NF) configuration mounts into a bracket system, matching the original factory mounting style used in many Sundance and Jacuzzi spas since 2007.

With a pure copper winding motor, anti-creep bearings for quiet operation, and a rotatable wet end for flexible plumbing alignment, the 56WUA400-I (NF) combines dependable power with straightforward installation.

⭐ Key Features

• ✅ 2.5 HP Continuous / 4.0 HP BHP – Powerful single-speed motor delivers strong jet pressure for hydrotherapy massage
• ✅ 230V / 60Hz Operation – US-standard electrical configuration at 12.0 amps
• ✅ 56-Frame Thru-Bolt Motor – Large frame design runs cooler and quieter than 48-frame pumps
• ✅ 2″ MBT Suction and Discharge – Center suction with side discharge configuration, measures approximately 3″ OD across threads
• ✅ Rotatable Wet End – Can be rotated in 90-degree increments to align with your existing plumbing
• ✅ Pure Copper Winding Motor – Cools faster and lasts longer than aluminum winding alternatives
• ✅ Anti-Creep Bearings – High-temperature grease-packed bearings for quieter, longer-lasting operation
• ✅ Thermal Motor Protection – Texas Instruments thermal protector prevents overheating damage
• ✅ 80,000 Capacitor Cycle Tests – Rigorously tested capacitor for long-term reliability
• ✅ Mechanical Shaft Seal – Ensures watertight operation during continuous use
• ✅ UL, CUL, ETL Certified – Listed for safety in the United States and Canada
• ✅ Unions Included – 2″ unions provided for faster installation

⚙️ Technical Specifications

Specification	Value
Pump Type	Jet Pump (Single Speed)
Manufacturer	Guangdong Lingxiao Pump Industry Co., Ltd. (LX)
Model Number	56WUA400-I (NF)
Motor Power	2.5 HP Continuous / 4.0 HP Brake-Torque
Speed Settings	Single Speed
Flow Rate (Max)	202 GPM
Voltage	230V
Frequency	60 Hz
Amperage	12.0 A
Frame Type	56Y (56 Frame Thru-Bolt)
Suction Port	2″ MBT (approximately 3″ OD across threads)
Discharge Port	2″ MBT (approximately 3″ OD across threads)
Suction Style	Center Suction
Discharge Style	Side Discharge
Drain Plug Locations	3, 6, 9 o’clock
Dimensions (L × W × H)	16-7/16″ × 8-3/4″ × 8-7/8″
Weight	38.1 lbs
Seal Type	Mechanical Shaft Seal
Motor Design	Pure Copper Winding with Anti-Creep Bearings
Thermal Protection	Texas Instruments Thermal Protector
Mounting	Baseless (No Feet) – Bracket Required
Certifications	UL, CUL, ETL
Warranty	1 Year Manufacturer’s Warranty

⚠️ HP Rating Note: This pump was originally labeled as 2.5 HP by Sundance/Jacuzzi but is labeled in the aftermarket as 4.0 HP (brake-torque horsepower). The amp draw of 12.0A is the most reliable specification for comparing electrical compatibility with your existing pump.

⚡ Electrical Requirements

Electrical Spec	Requirement
Supply Voltage	230V
Frequency	60 Hz
Phase	Single
Full Load Amps	12.0 A
Minimum Circuit Breaker	20 A (verify with a licensed electrician)

⚠️ IMPORTANT:

All electrical work must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and local building codes. Hot tubs require GFCI (Ground Fault Circuit Interrupter) protection. A dedicated circuit is required — do not share with other appliances.

This pump does NOT include an electrical cord. You can reuse the cord from the pump being replaced or purchase a new pump amp cord separately.

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🔗 Compatibility Guide

Frame Dimensions

Specification	This Pump
Frame Type	56Y (56 Frame Thru-Bolt)
Suction	2″ MBT – Center Suction
Discharge	2″ MBT – Side Discharge
Thread OD	Approximately 3″ outer diameter
Mounting	Baseless (NF) – Requires Bracket P/N 6000-535

Compatible Spa Brands and Models (Verified)

Sundance Spas:

• 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

Jacuzzi Spas:

• Older Theraflo models
• Older Piranha models

Other Brands:

• Clearwater Spas
• Divine Hot Tubs

⚠️ Note: This pump can also take the place of 6500-901, 6500-902, and 6500-903 pumps. However, some modification may be required to retrofit this pump if those earlier models were used. Always verify your existing pump specifications before ordering.

Also Replaces Waterway Executive

This pump is a replacement option for the Waterway 56 Frame, 4.0 HP, 1-Speed, 230V pump — Model 3711621-1D.

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🔄 Alternate Part Numbers & Cross-Reference

Part Number	Source / Context
56WUA400-I (NF)	Primary LX Model Number (Baseless / No Feet)
56WUA400-I	LX Model Number (With Welded Feet version)
WUA400-I	Abbreviated LX Model
6500-352	Sundance / Jacuzzi OEM
6500-352S	Sundance / Jacuzzi OEM
6500-363	Sundance / Jacuzzi OEM
6500-365	Sundance / Jacuzzi OEM
SD6500-352	Sundance Distributor Code
SD6500-363	Sundance Distributor Code
SD6500-365	Sundance Distributor Code
6500-363S	Sundance / Jacuzzi Variant
390618	In The Swim / Leslie’s Item Number
14403539	Opentip Item Number
05225980-2	Alternate Distributor Code
LX56WUA400INF	Combined Model Identifier
10-56WUA400-NF1	Pool-Spa-Supplies Identifier

Replaces earlier Sundance/Jacuzzi pump models (may require modifications):

Part Number	Notes
6500-901	Earlier Sundance pump — use with bracket 6000-535
6500-902	Earlier Sundance pump — use with bracket 6000-535
6500-903	Earlier Sundance pump — use with bracket 6000-535

💡 Important: The 56WUA400-I (NF) is the baseless version. If your existing pump has welded-on feet/base, you need the version WITH feet — Model 56WUA400-I (without the NF designation). Verify your mounting style before ordering.

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🛠️ Installation Requirements

Mounting

Requirement	Specification
Mounting Style	Baseless (No Feet) — bracket mounted
Mounting Bracket	Sundance P/N 6000-535 (sold separately)
Position	Horizontal — must be installed below water level (flooded suction)
Ventilation	Ensure adequate airflow around motor for cooling
Access	Allow sufficient clearance for maintenance and wet end rotation

Plumbing

Connection	Size
Suction	2″ MBT (center)
Discharge	2″ MBT (side)
Thread OD	Approximately 3″ across threads
Unions	Included with pump

Wet End Rotation

The wet end on this pump can be rotated in 90-degree increments to line up with your existing plumbing. This makes installation significantly easier when replacing pumps with different discharge orientations.

Installation Notes

⚠️ Pump must be installed below water level (flooded suction)

⚠️ Never run pump dry — water acts as a coolant and lubricant for the mechanical shaft seal; running dry causes seal damage

⚠️ Ensure proper grounding and bonding per NEC requirements

⚠️ GFCI protection is required by code

⚠️ Pump does NOT include an electrical cord — reuse your existing cord or purchase separately

⚠️ Motor wiring terminals are clearly labeled on the pump label — follow the wiring diagram provided with the pump

⚠️ Pump and motor manufacturers reserve the right to change design and motor improvements; minor changes in amp rating, accessories, and colors may occur without notice while maintaining the same functionality

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🔧 Maintenance Guide

Routine Maintenance

Task	Frequency	Notes
Check for leaks	Monthly	Around seal area and unions
Inspect unions	Monthly	Tighten if needed — hand-tight only
Clean strainer/filter	As needed	Remove debris that restricts flow
Check amperage draw	Annually	Should match 12.0A rating
Inspect motor vents	Quarterly	Keep clear of debris for cooling
Check mounting bracket bolts	Quarterly	Tighten if loose
Inspect wet end for calcium buildup	Every 6 months	Descale if necessary

Warning Signs — Replace Pump If:

• Unusual noise (grinding, screeching, or rattling sounds)
• Water leaking from the mechanical seal area
• Motor trips the circuit breaker repeatedly
• Noticeably reduced water flow at jets
• Motor overheating or shutting down during operation
• Visible corrosion or damage to the wet end

Seal Replacement

📍 Seal Type: Mechanical Shaft Seal

⚠️ Replace the seal at the first sign of leakage to prevent further motor damage

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🎯 Ideal Applications

Application	Suitability	Notes
♨️ Hot tub jet pump	Yes	Primary application — powerful single-speed jet operation
♨️ Sundance / Jacuzzi replacement	Yes	Direct OEM replacement for 6500-352, 6500-363, 6500-365
♨️ General spa jet pump	Yes	Compatible with any spa using 56-frame, 2″ plumbing, 230V
🛁 Whirlpool bath	No	Designed for hot tub/spa systems, not whirlpool baths

❓ Frequently Asked Questions

Q: What horsepower is this pump? A: This pump is rated at 2.5 HP continuous duty (also marketed as 4.0 HP brake-torque horsepower). The most important specification for electrical compatibility is the 12.0-amp draw at 230V.

Q: What is the difference between 56WUA400-I and 56WUA400-I (NF)? A: The “NF” designation means “No Feet” — this is the baseless version that mounts into a bracket (P/N 6000-535, sold separately). The 56WUA400-I without the NF designation has welded-on feet/base. Performance is identical between both versions.

Q: Will this fit my Sundance or Jacuzzi spa? A: This pump is a direct replacement for Sundance and Jacuzzi models using OEM part numbers 6500-352, 6500-363, and 6500-365. It fits 2007+ J-400 series, all J-LX and J-LXL models, and 2010+ J-375, J-365, J-355, J-280, and J-270 models.

Q: What voltage does this pump require? A: 230V / 60Hz. All electrical installation must be performed by a licensed electrician. Using the wrong voltage will damage the motor.

Q: Does this pump come with a power cord? A: No, this pump does NOT include a power cord. You can reuse the electrical cord from your existing pump or purchase a new pump amp cord separately.

Q: Does this pump come with unions? A: Yes, unions are included with the pump.

Q: What size are the ports? A: Both suction (center) and discharge (side) ports are 2″ MBT. The outer diameter across the threads measures approximately 3 inches. These connect to 2-inch inner diameter plumbing/hose.

Q: Can I rotate the wet end to match my plumbing? A: Yes, the wet end can be rotated in 90-degree increments to align with your existing plumbing layout.

Q: Does this pump require a mounting bracket? A: Yes, this is the baseless (NF) version and requires a mounting bracket. The compatible bracket is Sundance P/N 6000-535, sold separately.

Q: Is this a single or dual speed pump? A: This is a single-speed pump. If you need a dual-speed version, see the 56WUA400-II (NF).

Q: What warranty is included? A: This pump comes with a 1-year manufacturer’s warranty. Contact Parts4Tubs for full warranty terms.

Q: How do I know if my pump needs replacing? A: Signs include unusual noise (grinding, screeching), leaking from the seal area, reduced jet flow, motor tripping the breaker, or the motor overheating.

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 about the wiring connections? A: Motor terminals are clearly labeled on the pump. Follow the wiring diagram provided with the pump. Note that terminal positions may differ from your previous pump — do not assume wires go in the same locations.

Q: Can I use the 2-speed version (56WUA400-II) as a single-speed pump? A: Yes, the 56WUA400-II can be wired as a single-speed pump by connecting only the high-speed terminal and using a 3-wire 1-speed pump cord instead of a 4-wire 2-speed cord.

🏆 Why Choose the LX 56WUA400-I (NF)

• ✅ Direct OEM Replacement – Purpose-built to replace Sundance and Jacuzzi 6500-352, 6500-363, and 6500-365 pumps
• ✅ Pure Copper Motor Windings – Superior heat dissipation for longer motor life compared to aluminum alternatives
• ✅ Anti-Creep Bearings – Quieter operation with high-temperature grease for extended bearing life
• ✅ 56-Frame Motor – Larger frame runs cooler and quieter than 48-frame equivalents
• ✅ Rotatable Wet End – 90-degree rotation increments simplify installation with existing plumbing
• ✅ UL, CUL, ETL Certified – Independently tested and listed for safety
• ✅ 1-Year Manufacturer Warranty – Backed by Guangdong Lingxiao Pump Industry Co., Ltd.

🤝 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
• ✅ Replacement seals, brackets, and parts available
• ✅ Dedicated customer service team

✨ Summary

The LX Lingxiao 56WUA400-I (NF) is a proven single-speed jet pump delivering 2.5 HP continuous power at 230V/60Hz through a quiet, durable 56-frame motor. Purpose-built as a direct replacement for Sundance and Jacuzzi OEM pumps (6500-352, 6500-363, 6500-365), it features a rotatable wet end, pure copper windings, anti-creep bearings, and UL/CUL/ETL certification. The baseless design mounts into existing bracket systems for a straightforward swap. Order with confidence from Parts4Tubs — your trusted source for hot tub and spa parts.

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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: 501 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
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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.