♨️ LX Lingxiao WTC50M-USA (Long Snout) Spa Circulation Pump – 230V 48-Frame 1-1/2″ MBT — Sundance & Jacuzzi Replacement

The correct replacement for Sundance 6500-907 and Jacuzzi J-400 circulation pumps (post 7/2011)

📋 Product Overview

The LX WTC50MLS (also known as WTC50M-USA) is the Long Snout / Long Thread version of the WTC50M circulation pump platform, specifically designed as a direct replacement for Sundance and Jacuzzi spa circulation pumps — most notably the 6500-907 (post July 2011) and 6500-913. This is the pump you need if your spa is a Sundance or Jacuzzi model built after 2006 that uses a WTC50M-style circulation pump.

The critical difference between this pump and the Standard version (WTC50MSTD) is the longer wet end threads — Sundance and Jacuzzi spas require this additional thread length for the union connections to reach properly through the spa’s equipment bay mounting. The motor, flow rate, electrical specifications, and all other performance characteristics are identical to the Standard version. The pump delivers 35 GPM at 230V / 60Hz with a draw of only 1.0A from its 48-frame motor running at 1700 RPM — roughly half the speed of typical spa pumps for significantly quieter operation.

The wet end comes positioned in the orientation used by Sundance spas and can be rotated in 90-degree increments (12:00, 3:00, 6:00, or 9:00) by loosening the 4 through-bolts with a 7mm socket wrench. Includes two 1-1/2″ plumbing unions with o-rings (2-3/8″ outside diameter on connectors). The mounting base has been updated to a single-piece design instead of the small individual feet that were prone to breaking during shipping in earlier versions.

✨ Key Features

• ✅ Replaces Sundance 6500-907 (Post 7/2011) — Direct replacement with correct long thread length
• ✅ Replaces Sundance 6500-913 — Direct replacement for Sundance/Jacuzzi applications
• ✅ 35 GPM Flow Rate — High-flow circulation for effective 24/7 filtration and water treatment
• ✅ 48-Frame Motor / 230V / 1.0A — Robust spa-standard frame with low amperage draw
• ✅ 1700 RPM Low-Speed Motor — Roughly half the speed of standard spa pumps for whisper-quiet operation
• ✅ Long Snout / Long Threads — Extended wet end thread length required for Sundance/Jacuzzi installations
• ✅ 1-1/2″ MBT Suction & Discharge — Standard spa union thread size with side discharge (2-3/8″ OD on connectors)
• ✅ Unions with O-Rings INCLUDED — Two 1-1/2″ plumbing unions included for direct installation
• ✅ Rotatable Wet End — 4 positions (12:00, 3:00, 6:00, 9:00) using 7mm socket wrench on 4 through-bolts
• ✅ Chemical-Resistant Mechanical Seal — Designed for continuous duty in treated spa water
• ✅ Updated Single-Piece Base — Improved design replaces earlier individual feet that could break in transit
• ✅ 12-Month Warranty — Manufacturer warranty coverage

🔩 Technical specifications

⚠️ CORD NOTE: This pump does NOT include a power cord. Reuse your existing cord from the old pump, or purchase a compatible AMP cord separately. The wiring diagram is on the side of the motor.

⚡ Electrical Requirements

Wiring Connections (diagram on motor):

• White wire → “N” (Common/Neutral) terminal
• Black wire → “L” (Line/Hot) terminal
• Green wire → Ground screw (bottom right)

⚠️ 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.

⚠️ CRITICAL — 230V ONLY:

This pump operates on 230V / 60Hz only. It cannot be wired for 115V. Verify your spa’s electrical supply before ordering.

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🔗 Compatibility Guide

🛒 Recommended items

⚠️ CRITICAL — Which WTC50M Version Do You Need?

Your Situation	Correct Pump
Sundance or Jacuzzi spa with 6500-907 (post 7/2011)	✅ WTC50MLS (This Pump) — Long threads
Sundance or Jacuzzi spa with 6500-913	✅ WTC50MLS (This Pump) — Long threads
Jacuzzi J-400 Premium series (2006+)	✅ WTC50MLS (This Pump) — Long threads
Sundance with older 6000-907 (pre 7/2011)	❌ Use 48WTC0153C-I instead
Water’s Edge, Dr Wellness, Keys Backyard, Interspa	❌ Use WTC50M-Standard (WTC50MSTD) — shorter threads, lower cost
Other brands with standard-length threads	❌ Use WTC50M-Standard (WTC50MSTD) — shorter threads, lower cost

WTC50M Platform — Complete Variant Guide

Model	Thread Length	Replaces	Primary Application
WTC50MLS / WTC50M-USA (This Pump)	Long threads	6500-907 (post 7/2011), 6500-913	Sundance / Jacuzzi spas
WTC50MSTD / WTC50M-Standard	Short threads	General spa circ pumps	Water’s Edge, Dr Wellness, Keys Backyard, Interspa
48WTC0153C-I	Standard	6000-907 (pre 7/2011), Waterway Iron Might, Aqua-Flo CMHP	Older Sundance/Jacuzzi + general spa use, dual voltage 115V/230V
WTC50M-A (6500-920, 6500-910)	Sundance-exclusive	N/A	Sundance-exclusive — different suction/discharge alignment
WTC50M-B (6500-067)	Sundance-exclusive	N/A	Sundance-exclusive — different suction/discharge alignment

💡 Thread Length is the ONLY difference between the WTC50MLS (this pump) and WTC50M-Standard. Thread pitch, union size, motor, flow rate, and all other specifications are identical. The Long Snout version costs slightly less at Parts4Tubs ($144.25 vs $171.38 for Standard).

WTC50MLS vs WTC50M-Standard — Side by Side

Feature	WTC50MLS (This Pump)	WTC50M-Standard
Thread Length	Long (USA/Sundance)	Short (Standard)
Sundance/Jacuzzi Compatible	✅ Yes — direct fit	❌ No — threads too short
Flow Rate	35 GPM	35 GPM
Voltage / Amperage	230V / 1.0A	230V / 1.0A
RPM	1700	1700
Frame	48	48
Connections	1-1/2″ MBT Side Discharge	1-1/2″ MBT Side Discharge
Unions Included	✅ Yes	✅ Yes
Cord Included	❌ No	⚠️ Varies

Replaces These Part Numbers

Part Number	Application
6500-907	Sundance / Jacuzzi — Post July 11, 2011
6500-913	Sundance / Jacuzzi
WTC50M	General WTC50M reference (long thread version)

Compatible Sundance & Jacuzzi Models

The WTC50MLS replaces the circulation pump in Sundance and Jacuzzi models built after 2006 that use the 6500-907 or 6500-913 circ pump, including:

• ♨️ Jacuzzi J-400 Premium Series (2006+)
• ♨️ Sundance 780 Series — Including Certa and other models
• ♨️ Sundance Spas — Various models post July 2011 with 6500-907
• ♨️ Jacuzzi Premium Hot Tubs — Various models with WTC50M circulation pump

⚠️ MOUNTING NOTE: The mounting bolt positions on this pump’s base may differ from your original pump’s base. You may need to relocate or modify the mounting bolt positions on your spa floor.

⚠️ FREEZE LINE NOTE: The barbed fitting sometimes found on the front of the wet end (connected to 3/8″ tubing for freeze protection) is NOT included. If your installation requires this fitting, order it separately. See freeze line adapter 6540-171 and its o-ring 6540-263.

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🔩 Alternate Part Numbers & Cross-References

🔧 Parts and fittings for this

Primary Part Numbers

Part Number	Description
WTC50MLS	Parts4Tubs SKU
WTC50M-USA	LX / Lingxiao — USA Long Snout Model
34-343-1076	Alternate distributor number

Replaces These Part Numbers

Part Number	Application
6500-907	Sundance / Jacuzzi — Post July 2011
6500-913	Sundance / Jacuzzi

Related But NOT Interchangeable

Part Number	Description
WTC50MSTD / WTC50M-Standard	Short thread version — NOT for Sundance/Jacuzzi
6000-907	Older Sundance (pre 7/2011) — use 48WTC0153C-I instead
6500-905	Different Sundance model — verify compatibility
6500-920 / 6500-910 (WTC50M-A)	Sundance-exclusive — different alignment
6500-067 (WTC50M-B)	Sundance-exclusive — different alignment

Compatible Accessories

Part Number	Description
6540-171	Stainless steel freeze line adapter / hose barb (for wet end front)
6540-263	O-ring for freeze line adapter 6540-171
A03070053	Replacement impeller for WTC50M

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🛠️ Installation Requirements

What’s in the Box

• ✅ LX WTC50MLS Circulation Pump (Long Snout)
• ✅ Two 1-1/2″ Plumbing Unions with O-Rings
• ❌ Power cord NOT included — reuse existing or purchase separately

Mounting

Requirement	Specification
Position	Below water level (NOT self-priming)
Orientation	Horizontal — motor must remain dry
Frame	48 — with updated single-piece base
Mounting Holes	~3-1/2″ front-to-back × 4-3/8″ side-to-side center-to-center
Base	Screw to solid, level surface — may need new holes if original spacing differs

Plumbing

Connection	Size
Suction	1-1/2″ MBT — Center (2-3/8″ OD)
Discharge	1-1/2″ MBT — Side (2-3/8″ OD)
Unions	1-1/2″ with O-Rings — INCLUDED

Wet End Rotation

The pump ships with the discharge in the standard Sundance position. To rotate:

1. Use a 7mm socket wrench to loosen the 4 through-bolts at the front of the motor
2. Rotate the wet end to the desired position (12:00, 3:00, 6:00, or 9:00)
3. Retighten all 4 through-bolts evenly

Wiring (Diagram on Motor Side)

• White wire → “N” (Common/Neutral) terminal
• Black wire → “L” (Line/Hot) terminal
• Green wire → Ground screw (bottom right)

Installation Notes

⚠️ GFCI protection is required by the National Electrical Code (NEC) for all hot tub and spa installations.

⚠️ 230V ONLY — this pump cannot be wired for 115V.

⚠️ Mounting bolt positions may differ from your original pump. Be prepared to drill new mounting holes if needed.

⚠️ The freeze line barbed fitting (3/8″ tubing) is NOT included — order 6540-171 and 6540-263 separately if needed.

⚠️ Never run the pump dry — ensure the spa is filled and air bled before first startup.

⚠️ If replacing 6500-907, rotate the wet end to match your existing plumbing before final installation.

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🔧 Maintenance Guide

Routine Maintenance

Task	Frequency	Notes
Check for leaks at seal	Monthly	Inspect around shaft seal area
Check union connections	Monthly	Tighten and inspect o-rings
Verify flow rate	Monthly	Reduced flow indicates clogging or impeller wear
Inspect wiring connections	Quarterly	Check terminals for tightness
Check mounting bolts	Quarterly	Tighten if loose
Clean wet end / impeller	As needed	Remove debris restricting flow

Warning Signs — Replace Pump If:

• Water leaking from shaft seal area
• Unusual noise (grinding, squealing, rattling)
• Reduced or no water flow
• Motor overheating (thermal protection tripping)
• Motor fails to start or trips breaker
• Visible damage to wet end or motor housing

Spare Parts

• 📍 Impeller: A03070053
• 📍 Seal, wet end, fan, and faceplate o-ring available as spare parts

🎯 Ideal Applications

Application	Suitability	Notes
♨️ Sundance 6500-907 (Post 7/2011)	✅ Yes — Direct Replacement	Long thread version — correct fit
♨️ Sundance 6500-913	✅ Yes — Direct Replacement	Long thread version — correct fit
♨️ Jacuzzi J-400 Premium (2006+)	✅ Yes	WTC50M long thread version
♨️ Sundance 780 Series	✅ Yes	Including Certa and other models
♨️ 24/7 Spa Circulation & Filtration	✅ Yes	35 GPM continuous duty at 1700 RPM
♨️ Quiet Operation Priority	✅ Yes	1700 RPM — roughly half speed of typical pumps
♨️ Sundance 6000-907 (Pre 7/2011)	❌ No — Different Model	Use 48WTC0153C-I instead
♨️ Water’s Edge / Dr Wellness / Interspa	❌ No — Wrong Thread	Use WTC50M-Standard instead (shorter threads, may be lower cost)
🛁 115V Spa Systems	❌ No — 230V Only	Use 48WTC0153C-I (dual voltage) instead
🛁 3/4″ Barb Plumbing	❌ No — Wrong Size	Use WE10 instead

❓ Frequently Asked Questions

Q: Does this replace Sundance part number 6500-907? A: Yes — the WTC50MLS (WTC50M-USA) is the correct replacement for the Sundance/Jacuzzi 6500-907 manufactured after July 11, 2011. If your spa has the older 6000-907 (pre July 2011), you need the 48WTC0153C-I instead.

Q: What is the difference between this pump and the WTC50M-Standard? A: The ONLY difference is thread length on the wet end. This Long Snout/USA version has longer threads required for Sundance and Jacuzzi spas. All other specifications (motor, flow rate, amperage, RPM, connections) are identical. The thread pitch and union size are the same.

Q: Will this fit my Jacuzzi J-400? A: Yes — this pump is used in Jacuzzi J-400 Premium series spas built after 2006. Rotate the wet end to match your existing plumbing orientation before final installation.

Q: Is a power cord included? A: No. You must reuse the existing cord from your old pump or purchase a compatible cord separately. Simply unwire the old pump and connect the wires to the same terminals on the new pump following the wiring diagram on the motor.

Q: Can the wet end be rotated? A: Yes. The wet end can be rotated to 4 positions (12:00, 3:00, 6:00, 9:00) using a 7mm socket wrench to loosen the 4 through-bolts at the front of the motor. The pump ships in the standard Sundance orientation.

Q: Do I need the freeze line fitting? A: If your original pump has a barbed fitting on the front of the wet end connected to 3/8″ tubing (freeze protection line), this fitting is NOT included with the new pump. Order the freeze line adapter (6540-171) and its o-ring (6540-263) separately.

Q: Will the mounting holes line up with my original pump? A: The mounting hole positions may differ from your original pump (approximately 3-1/2″ × 4-3/8″ center-to-center). You may need to drill new mounting holes in the spa floor. The updated single-piece base is more durable than the earlier individual feet design.

Q: What is the flow rate? A: 35 GPM — one of the highest-flow dedicated circulation pumps available.

Q: Why is this pump quieter than my old one? A: The WTC50M operates at 1700 RPM, roughly half the speed of typical 3450 RPM spa pumps. Lower RPM means less motor noise and vibration.

Q: Can this pump run on 115V? A: No. This pump operates on 230V only. For a dual-voltage option, see the 48WTC0153C-I.

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: 12-month manufacturer warranty. Contact Parts4Tubs for full terms.

🏆 Why Choose the LX WTC50MLS (Long Snout)

• ✅ Correct Replacement for Sundance 6500-907 (Post 7/2011) — Long threads fit properly
• ✅ Correct Replacement for Sundance 6500-913 — Verified Sundance/Jacuzzi compatibility
• ✅ 35 GPM High-Flow Circulation — Superior water turnover for 24/7 filtration
• ✅ 1700 RPM Whisper-Quiet Operation — Half the speed of typical pumps
• ✅ 48-Frame Spa Standard — Robust motor with thermal overload protection
• ✅ 4-Position Rotatable Wet End — Ships in Sundance orientation, adjustable to 12/3/6/9 o’clock
• ✅ Unions with O-Rings INCLUDED — Ready to install
• ✅ Updated Single-Piece Base — More durable than earlier individual feet design
• ✅ Chemical-Resistant Seal — Designed for continuous duty in treated spa water
• ✅ Energy Efficient — Just 1.0A draw at 230V for 24/7 operation
• ✅ Freeze Line Adapter Compatible — 6540-171 available separately if needed
• ✅ 12-Month Warranty — Manufacturer warranty coverage

🤝 Why Buy from Parts4Tubs

• ✅ Fast shipping across the United States
• ✅ Expert advice from spa and hot tub specialists
• ✅ Competitive pricing
• ✅ Full warranty support
• ✅ Hassle-free returns
• ✅ Both WTC50M versions in stock (Standard and Long Snout/USA)
• ✅ Complete LX circulation pump range available
• ✅ Sundance and Jacuzzi replacement expertise
• ✅ Dedicated customer service team

💧 Summary

The LX WTC50MLS (WTC50M-USA) is the Long Snout circulation pump designed specifically as a direct replacement for Sundance 6500-907 (post 7/2011) and 6500-913 in Sundance and Jacuzzi spas including the J-400 Premium series. Delivering 35 GPM through a 48-frame motor at 1700 RPM for whisper-quiet operation at just 1.0A on 230V/60Hz, this pump features extended wet end threads, 1-1/2″ MBT side discharge connections, 4-position rotatable wet end, included unions with o-rings, and updated single-piece base. Cord not included — reuse your existing cord. Freeze line adapter (6540-171) available separately. Order from Parts4Tubs today with 12-month warranty support.

Unions and pump cords: pick the union size that matches your pump's ports (see the size chart below), and a 4-wire cord for a 2-speed pump.

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
• Screwdriver
• New union O-rings
• A strap wrench, only if a union nut is stuck
• PVC primer and cement, only if you are gluing in new tailpieces

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. Unscrew the union nuts by hand. If one is stuck, use a strap wrench rather than a pipe wrench, which can crack the nut. 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. Pump unions use buttress threads that seal on an O-ring, so fit new O-rings and hand-tighten the nuts. Do not use thread tape, pipe dope or sealant on them.

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, hand-tightening the union nuts. If you are gluing in new PVC tailpieces, use PVC primer and cement on those joints.

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.