🛁 LX Lingxiao WTC50M-Standard Spa Circulation Pump – 230V 48-Frame 1-1/2″ MBT Side Discharge
Heavy-duty 35 GPM 24-hour circulation pump for spa filtration and water treatment
🔄 Product Overview
The LX WTC50M-Standard is a dedicated 24-hour spa circulation pump manufactured by Lingxiao (LX) Pump, featuring a robust 48-frame motor with 1-1/2″ Male Buttress Thread (MBT) connections and side discharge wet end. This is the Standard (shorter thread) version of the WTC50M platform — designed for general spa applications where standard-length wet end threads are used. It delivers 35 GPM flow at 230V / 60Hz with a draw of only 1.0A, making it one of the highest-flow dedicated circulation pumps in the LX lineup.
The WTC50M features an energy-efficient motor running at 1700 RPM — roughly half the speed of most spa pumps — resulting in significantly quieter operation than typical 3450 RPM pumps. Its rotatable wet end can be repositioned in 90-degree increments to match your existing plumbing layout. The pump includes two 1-1/2″ plumbing unions with o-rings for direct connection to standard spa plumbing, and uses a mechanical seal with chemical-resistant material designed for long-term continuous duty in treated spa water.
This pump is found as OEM equipment in Water’s Edge, Dr Wellness, Keys Backyard, Interspa, and many other hot tub brands. The reinforced high-strength engineering plastic base provides vibration resistance and corrosion resistance. Important: This is the Standard version with shorter threads — it is NOT a direct replacement for Sundance/Jacuzzi models that require the longer-thread WTC50M-USA (WTC50MLS) version.
⭐ Key Features
- ✅ 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 significantly quieter operation
- ✅ 1-1/2″ MBT Suction & Discharge — Standard spa union thread size with side discharge
- ✅ Unions with O-Rings INCLUDED — Two 1-1/2″ plumbing unions included for direct installation
- ✅ Rotatable Wet End — Repositionable in 90-degree increments to match your plumbing layout
- ✅ Chemical-Resistant Mechanical Seal — Designed for continuous duty in chlorinated and brominated spa water
- ✅ Reinforced Engineering Plastic Base — Vibration-resistant and corrosion-resistant mounting platform
- ✅ Energy Efficient — 24-hour continuous duty operation at just 1.0A / 230V
- ✅ Thermal Overload Protection — Built-in motor protection against overheating
- ✅ OEM Equipment in Multiple Brands — Water’s Edge, Dr Wellness, Keys Backyard, Interspa, and more
- ✅ 12-Month Warranty — Manufacturer warranty coverage
🔧 Technical Specifications
| Specification | Value |
|---|---|
| Manufacturer | LX / Lingxiao Pump |
| Model | WTC50M-Standard |
| SKU | WTC50MSTD |
| Pump Type | Circulation Pump — 24-Hour Continuous Duty |
| Motor Type | Single Phase — Capacitor Run |
| Voltage | 230V |
| Frequency | 60 Hz |
| Phase | Single Phase |
| Amperage | 1.0A |
| Speed | Single Speed |
| RPM | 1700 |
| Flow Rate | 35 GPM |
| Frame | 48 |
| Suction Connection | 1-1/2″ MBT — Center |
| Discharge Connection | 1-1/2″ MBT — Side |
| Seal Type | Mechanical Shaft Seal — Chemical-Resistant Material |
| Base | Reinforced Engineering Plastic — Vibration/Corrosion Resistant |
| Thermal Protection | Yes — Built-In Overload Protection |
| Unions | Two 1-1/2″ MBT Unions with O-Rings INCLUDED |
| Self-Priming | No — Must Be Installed Below Water Level |
| Warranty | 12 Months |
⚠️ CORD NOTE: A power cord may or may not be included depending on production run. Hot Tub Outpost states “Does not include a cord.” If no cord is included, reuse your existing cord or purchase a compatible AMP cord (402223) or 60-inch cord (21086) separately.
⚡ Electrical Requirements
| Electrical Spec | Requirement |
|---|---|
| Supply Voltage | 230V |
| Frequency | 60 Hz |
| Phase | Single Phase |
| Amperage | 1.0A |
⚠️ 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 operation. For a dual-voltage (115V/230V) circulation pump option, see the LX 48WTC0153C-I instead. Using the wrong voltage will damage the motor.
🔗 Compatibility Guide
WTC50M Family — Thread Length Variants
| Model | Thread Length | Primary Application | Replaces |
|---|---|---|---|
| WTC50M-Standard (This Pump) | Shorter threads | General spa use — Water’s Edge, Dr Wellness, Keys Backyard, Interspa, others | General 48-frame circ pumps with 1-1/2″ MBT |
| WTC50M-USA (WTC50MLS) | Longer threads/snout | Sundance / Jacuzzi spas | 6500-907, 6500-913 (post 7/2011) |
💡 Which WTC50M Do You Need? If your spa is a Sundance or Jacuzzi, you almost certainly need the WTC50M-USA (WTC50MLS) with longer threads. The Standard version has shorter threads that will NOT reach properly in Sundance/Jacuzzi installations. For all other brands, the Standard version is typically correct.
💡 CONVERSION TIP: The Standard version can be adapted for Sundance/Jacuzzi use by adding a 27241-004-000 vibration pad underneath, which raises the pump slightly to compensate for the shorter threads. The thread pitch and union size are identical between both versions.
LX WTC50M-Standard vs Related LX Circulation Pumps
| Feature | WTC50M-Standard (This Pump) | WE14 230V | WE10 230V | 48WTC0153C-I |
|---|---|---|---|---|
| Flow Rate | 35 GPM | See documentation | 18 GPM | See documentation |
| Voltage | 230V only | 230V only | 230V only | 115V/230V dual |
| Amperage | 1.0A | 1.0A | 0.8A | 0.8A (230V) / 1.6A (115V) |
| RPM | 1700 | 3450 | 3450 | See documentation |
| Connections | 1-1/2″ MBT | 1-1/2″ MBT | 3/4″ Barb | 1-1/2″ MBT |
| Discharge | Side | Side | Side | Side |
| Frame | 48 | 48Y | N/A | 48 |
| Replaces | General spa circ pumps | Laing E-14 | Laing E-10 | Waterway Iron Might, Aqua-Flo CMHP |
| Sundance/Jacuzzi | ❌ No — use USA version | ❌ No | ❌ No | ❌ Older models only (pre-7/2011 6000-907) |
Replaces / Cross-References
The WTC50M-Standard is used as OEM equipment and replacement in many hot tub brands. It can serve as a replacement for other 48-frame, 1-1/2″ MBT, side discharge circulation pumps where thread lengths are compatible.
⚠️ NOT a Direct Replacement For
| Part Number | Reason |
|---|---|
| 6500-907 (post 7/2011) | Requires WTC50M-USA (longer threads) for Sundance/Jacuzzi |
| 6500-913 | Requires WTC50M-USA (longer threads) for Sundance/Jacuzzi |
| 6500-920 / 6500-910 (WTC50M-A) | Sundance-exclusive model — different suction/discharge alignment |
| 6500-067 (WTC50M-B) | Sundance-exclusive model — different suction/discharge alignment |
| 6000-907 (pre 7/2011) | Older Sundance model — use 48WTC0153C-I instead |
Compatible Spa Brands (OEM & Aftermarket)
- ♨️ Water’s Edge
- ♨️ Dr Wellness
- ♨️ Keys Backyard
- ♨️ Interspa
- ♨️ Various other brands using standard-thread 48-frame 1-1/2″ MBT side discharge circulation pumps
🔩 Alternate Part Numbers & Cross-References
Primary Part Numbers
| Part Number | Description |
|---|---|
| WTC50MSTD | Parts4Tubs SKU |
| WTC50M-Standard | LX / Lingxiao — Standard Thread Model |
| WTC50M | Generic model reference (verify thread length) |
Related Models (NOT Interchangeable Without Verification)
| Part Number | Description |
|---|---|
| WTC50M-USA (WTC50MLS) | Long thread/snout version — for Sundance/Jacuzzi |
| 48WTC0153C-I | Dual-voltage (115V/230V) version — different motor |
| WTC50M-A | Sundance-exclusive (6500-920, 6500-910) — different alignment |
| WTC50M-B | Sundance-exclusive (6500-067) — different alignment |
Compatible Accessories
| Part Number | Description |
|---|---|
| 402223 | AMP cord for 1-speed pump operation |
| 21086 | 60-inch power cord |
| 27241-004-000 | Vibration pad — raises pump to approximate USA thread length |
| A03070053 | Replacement impeller for WTC50M |
🛠️ Installation Requirements
What’s in the Box
- ✅ LX WTC50M-Standard Circulation Pump
- ✅ Two 1-1/2″ Plumbing Unions with O-Rings
- ⚠️ Power cord may or may not be included — verify. If needed, purchase cord 402223 or reuse existing cord.
Mounting
| Requirement | Specification |
|---|---|
| Position | Below water level (NOT self-priming) |
| Orientation | Horizontal — motor must remain dry |
| Frame | 48 — with reinforced engineering plastic base |
| Base | Screw to solid, level surface |
Plumbing
| Connection | Size |
|---|---|
| Suction | 1-1/2″ MBT — Center |
| Discharge | 1-1/2″ MBT — Side |
| Unions | 1-1/2″ with O-Rings — INCLUDED |
Wet End Rotation
The wet end can be rotated in 90-degree increments to match your plumbing:
- Remove the screws on the front of the pump connecting the wet end to the motor
- Rotate the wet end to the desired position (side discharge orientation changes)
- Reinstall and tighten the screws evenly
- Reposition the base/feet if needed for the new orientation
Wiring
The wiring diagram is located on the side of the motor:
- 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. Verify your spa’s electrical supply before ordering.
⚠️ This is the STANDARD (shorter thread) version. If replacing a Sundance or Jacuzzi circulation pump, you likely need the WTC50M-USA (WTC50MLS) with longer threads instead.
⚠️ 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.
⚠️ Never run the pump dry — ensure the spa is filled with water and all air is bled from the plumbing before first startup.
⚙️ 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 power cord connections | Quarterly | Check for damage or loose terminals |
| Check mounting bolts | Quarterly | Tighten if loose |
| Clean wet end / impeller | As needed | Remove debris that may restrict 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 Availability
- 📍 Impeller: A03070053 — available as replacement part
- 📍 Seal: Available as replacement part
- 📍 Wet end: Available as replacement part
- ⚠️ Some retailers note this pump is NOT serviceable and no repair parts are available — verify with Parts4Tubs
🎯 Ideal Applications
| Application | Suitability | Notes |
|---|---|---|
| ♨️ 24/7 Spa Circulation & Filtration | ✅ Yes — Primary Application | 35 GPM continuous duty at 1700 RPM |
| ♨️ Water’s Edge / Dr Wellness / Keys Backyard | ✅ Yes — OEM Equipment | Standard thread version |
| ♨️ Interspa Hot Tubs | ✅ Yes — OEM Equipment | Standard thread version |
| ♨️ General 48-Frame Spa Circ Replacement | ✅ Yes | Verify thread length and discharge orientation |
| ♨️ Quiet Operation Priority | ✅ Yes | 1700 RPM — roughly half speed of typical spa pumps |
| ♨️ Sundance / Jacuzzi Spas | ❌ No — Wrong Thread Length | Use WTC50M-USA (WTC50MLS) instead |
| ♨️ Sundance 6500-907 (post 7/2011) | ❌ No — Wrong Thread Length | Use WTC50M-USA (WTC50MLS) instead |
| ♨️ Sundance 6000-907 (pre 7/2011) | ❌ No — Different Model | Use 48WTC0153C-I instead |
| 🛁 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: What is the flow rate of this pump? A: 35 GPM — one of the highest-flow dedicated circulation pumps available, providing excellent 24/7 filtration and water treatment circulation.
Q: What is the difference between WTC50M-Standard and WTC50M-USA? A: The only difference is thread length on the wet end. The Standard version has shorter threads suited for most spa brands. The USA version (WTC50MLS) has longer threads specifically designed for Sundance and Jacuzzi spas. The thread pitch, union size, motor, and all other specifications are identical. If you need the Standard version to work like the USA version, you can add a vibration pad (27241-004-000) underneath to raise the pump slightly.
Q: Will this fit my Sundance or Jacuzzi spa? A: No — the Standard version has shorter threads that will NOT reach properly in Sundance/Jacuzzi installations. You need the WTC50M-USA (WTC50MLS) with longer threads for those brands.
Q: Why is this pump quieter than other circulation pumps? 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, making it one of the quietest circulation pump options available.
Q: Can the wet end be rotated? A: Yes. The wet end can be rotated in 90-degree increments by removing the front screws, rotating to the desired position, and reinstalling the screws.
Q: Is a power cord included? A: This varies by production run. Some versions include an AMP cord while others do not. If no cord is included, reuse your existing cord or purchase a compatible AMP cord (402223) or 60-inch cord (21086) separately.
Q: Are unions included? A: Yes. Two 1-1/2″ MBT plumbing unions with o-rings are included.
Q: Can this pump run on 115V? A: No. The WTC50M-Standard operates on 230V only. For a dual-voltage (115V/230V) circulation pump, see the LX 48WTC0153C-I instead.
Q: What is the horsepower rating? A: Parts4Tubs lists 1/15 HP. Other retailers including the manufacturer’s Amazon listing specify 0.35 HP (250W). This discrepancy may reflect different rating methods. The pump draws 1.0A at 230V and delivers 35 GPM.
Q: What is the 3/8″ barbed fitting on the wet end? A: Some installations use a barbed fitting on the front of the wet end connected to 3/8″ tubing for freeze protection lines. This fitting is NOT included with the pump — if your installation requires it, order it separately.
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 warranty terms and support.
🏆 Why Choose the LX WTC50M-Standard
- ✅ 35 GPM High-Flow Circulation — Superior water turnover for effective 24/7 filtration
- ✅ 1700 RPM Quiet Operation — Half the speed of typical pumps for whisper-quiet performance
- ✅ 48-Frame Spa Standard — Familiar mounting pattern and robust motor construction
- ✅ 1-1/2″ MBT Side Discharge — Standard spa plumbing connections with unions included
- ✅ Rotatable Wet End — 90-degree increments to match any plumbing layout
- ✅ Chemical-Resistant Seal — Designed for continuous duty in treated spa water
- ✅ Reinforced Plastic Base — Vibration and corrosion resistant mounting platform
- ✅ Thermal Overload Protection — Built-in motor safety
- ✅ Energy Efficient — Just 1.0A draw at 230V for 24/7 operation
- ✅ OEM Equipment in Major Brands — Water’s Edge, Dr Wellness, Keys Backyard, Interspa
- ✅ Replacement Parts Available — Impeller (A03070053), seal, and wet end
- ✅ 12-Month Warranty — Manufacturer warranty coverage
🤝 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 in USD
- ✅ Full warranty support
- ✅ Hassle-free returns
- ✅ Both WTC50M versions in stock (Standard and USA/Long Snout)
- ✅ Complete LX circulation pump range available
- ✅ Dedicated customer service team
💫 Summary
The LX WTC50M-Standard is a dedicated 24-hour spa circulation pump delivering 35 GPM through a 48-frame motor at 1700 RPM for whisper-quiet operation at just 1.0A on 230V/60Hz. Featuring 1-1/2″ MBT side discharge connections, rotatable wet end, chemical-resistant mechanical seal, thermal overload protection, and included unions, this pump serves as OEM equipment in Water’s Edge, Dr Wellness, Keys Backyard, and Interspa hot tubs. This is the Standard (shorter thread) version — for Sundance/Jacuzzi spas, order the WTC50M-USA (WTC50MLS) with longer threads instead. Order from Parts4Tubs today with 12-month warranty 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)
-
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.
-
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.
-
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.
-
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.
-
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.
-
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.
-
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.
-
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.
-
Turn On the Power: Restore power to the hot tub by switching on the circuit breaker or reconnecting the disconnect switch.
-
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.
-
Refill the Hot Tub: Once you've confirmed that the new pump is functioning properly, refill the hot tub with water.
-
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.
-
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:
-
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.
-
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.
-
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.
-
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.
-
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.


















