⚙️ LX Lingxiao WTC50M-USA Spa Circulation Pump — 0.35 HP 230V 1-Speed 48-Frame 1-1/2″ MBT | Sundance & Jacuzzi Replacement

Direct drop-in replacement for Sundance and Jacuzzi 6500-907 — longer threads for perfect fitment, includes unions

♨️ Product Overview

The LX Lingxiao WTC50M-USA is a 0.35 HP (250W), 230V/60Hz, single-speed, 48-frame circulation pump engineered as the direct replacement for Sundance and Jacuzzi spa circulation pumps (OEM part number 6500-907, post 7/11/2011). This is the USA version with longer connection threads (longer snout) on the wet end — specifically designed for the thread length required by Sundance and Jacuzzi spas. Manufactured by LX Lingxiao (Powerful Water Technology Limited), a global leader in spa pump manufacturing for over 46 years. This pump features a pure copper motor winding for excellent cooling efficiency and extended motor life, combined with a mechanical seal for watertight long-term continuous operation. The reinforced engineering plastic base provides vibration resistance and corrosion resistance. Both the intake and discharge are 1-1/2″ MBT (Male Buttress Thread) with 2-3/8″ outside diameter on the pump connectors. The wet end features a side discharge and center suction, and can be rotated in 90-degree increments (12, 3, 6, and 9 o’clock positions) to align with your existing plumbing — the pump ships with the discharge in the 12 o’clock position. Two pump unions with O-rings are INCLUDED. The pump draws just 1.0 amp at 230V for minimal energy consumption during 24/7 operation. UL Certified for the US market. Backed by a 1-year manufacturer’s limited warranty.

⚠️ CRITICAL: USA vs STANDARD Version — Thread Length Difference: The WTC50M-USA has longer connection threads (longer snout) than the WTC50M-STANDARD. If you are replacing a Sundance or Jacuzzi 6500-907 (post 7/11/2011), this is the correct pump. If your existing pump has shorter threads, use the WTC50M-STANDARD instead. Thread pitch, thread type, and union size are the same between both versions — only the thread length differs.

⚠️ Pre-2011 Sundance Pumps: If you have the older Sundance part number 6000-907 (pre 7/11/2011), this pump is NOT the correct replacement. Use the 48WTC0153C-I (dual-voltage 115/230V LX circulation pump) instead.

⚠️ HP Rating Note: This pump is sold under various HP designations by different retailers including 0.35 HP, 1/3 HP, 1/8 HP, 1/15 HP, and 1/5 HP — these all refer to the same pump. The actual power rating is 0.35 HP / 250 watts. For replacement matching, always use amperage (1.0A at 230V) rather than HP rating.

⭐ Key Features

✅ Direct Sundance / Jacuzzi 6500-907 Replacement — Longer threads for perfect fitment in Sundance and Jacuzzi spas (post 7/2011)

✅ 0.35 HP / 250W Energy-Efficient Motor — Only 1.0 amp draw at 230V for minimal electricity cost during 24/7 operation

✅ 24-Hour Continuous Circulation — Runs around the clock for constant filtration, heating, and water quality

✅ Pure Copper Motor Winding — Superior cooling efficiency and extended motor life

✅ Mechanical Seal — Watertight operation for long-term continuous duty

✅ Unions with O-Rings INCLUDED — Two 1-1/2″ pump unions included in the box

✅ Side Discharge / Center Suction — Rotatable wet end with 4 positions (12, 3, 6, 9 o’clock)

✅ 48-Frame Design — Industry-standard mounting for broad spa compatibility

✅ Reinforced Engineering Plastic Base — Vibration-resistant, corrosion-resistant, updated single-piece design

✅ Ultra-Quiet Operation — Runs at 1700 RPM for whisper-quiet circulation

✅ UL Certified — Tested and approved for the US market

✅ 1-Year Manufacturer’s Limited Warranty — Backed by LX Lingxiao

🔩 Technical Specifications

Specification	Value
Manufacturer	LX Lingxiao (Powerful Water Technology Limited)
Model	WTC50M-USA
Pump Type	Circulation Pump — Side Discharge
Horsepower	0.35 HP / 250W (also rated as 1/3 HP, 1/15 HP, 1/8 HP — same pump)
Speed Settings	1-Speed (Single Speed)
RPM	1700 (60 Hz)
Voltage	230V
Frequency	60 Hz
Phase	Single Phase
Amperage	1.0A
Frame Type	48 Frame (LX48)
Discharge Type	Side Discharge
Suction Style	Center Suction
Discharge Size	1-1/2″ MBT (2-3/8″ outside diameter on connectors)
Suction Size	1-1/2″ MBT (2-3/8″ outside diameter on connectors)
Thread Type	USA (longer threads / longer snout — for Sundance/Jacuzzi fitment)
Wet End Rotation	90° increments (12, 3, 6, 9 o’clock) — ships at 12 o’clock
Motor Winding	Pure Copper
Seal Type	Mechanical Seal (carbon ceramic)
Base Material	Reinforced engineering plastic — vibration and corrosion resistant (updated single-piece design)
Mounting Holes	Approximately 3-1/2″ center-to-center front-to-back, 4-3/8″ center-to-center side-to-side
Dimensions (L × W × H)	11-7/8″ × 6-1/2″ × 7-11/16″
Unions	INCLUDED — 2 × 1-1/2″ pump unions with O-rings
Cord	NOT INCLUDED — reuse existing cord or purchase separately
Freeze Protection Barb	NOT INCLUDED — 3/8″ barbed fitting sold separately if needed
Certifications	UL Certified
Warranty	1-Year Manufacturer’s Limited Warranty

⚠️ Flow Rate Note: Multiple retailers list this pump at 35 GPM maximum flow rate. LX Lingxiao (the manufacturer) rates the WTC50M series at 63 GPM on some listings. This variance may reflect different test conditions or measurement methods.

⚠️ Plug Note: This pump may come with a 115V-style wall plug — however, it cannot be used on a standard 115V wall outlet. This plug style is used by some hot tub control systems. You may need to cut the plug off and hardwire the pump, or reuse your existing cord from the old pump.

⚡ Electrical Requirements

Electrical Spec	Requirement
Supply Voltage	230V
Frequency	60 Hz
Phase	Single Phase
Full Load Amps	1.0A
RPM	1700
Wiring Diagram	Located on the side of the motor

Wiring Connections

Terminal	Wire Color	Function
“N”	White	Neutral / Common
“L”	Black	Line / Load
Ground Screw	Green	Equipment Ground

⚠️ 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. Hot tubs require GFCI (Ground-Fault Circuit Interrupter) protection. A dedicated circuit is required — do not share with other appliances. This is a 230V pump — do NOT connect to a 115V circuit. Verify your existing pump’s voltage before ordering. Using the wrong voltage will damage the motor.

⚠️ Cord NOT Included: This pump does not include a power cord. Reuse your existing cord from the old pump, or purchase a compatible AMP cord separately (part number 402223 for 1-speed operation, or 60-inch cord 21086).

🔄 Compatibility Guide

✅ Sundance Spa Models — Confirmed Compatible (Post 7/19/2011)

Sundance Series	Models	Year
Select Series	All models	07/19/2011+
880 Series	All models	07/19/2011+
Aspen	All models	2012+
780 Series	Certa, Montclair	04/2013+
780 Series	Hamilton, Chelsee	03/2013+

✅ Jacuzzi Spa Models — Confirmed Compatible

Jacuzzi Series	Models	Year
J-500 Series	All J-500 models	2015+
J-400 Series	All J-400 models except J-415	1/26/2012+
J-415	J-415 only	10/2/2013+
J-300 Series	J-375, J-365, J-355, J-345, J-335	2012+
J-LX / J-LXL	All models	2011+

⚠️ CRITICAL: WTC50M-USA vs WTC50M-STANDARD

Feature	WTC50M-USA (THIS PUMP)	WTC50M-STANDARD
Thread Length	LONGER threads (longer snout)	SHORTER threads
Thread Pitch / Size	Same	Same
Union Size	Same 1-1/2″ (2-3/8″ OD)	Same 1-1/2″ (2-3/8″ OD)
Sundance / Jacuzzi Compatible	✅ YES — direct replacement	❌ NO — threads too short
Replaces 6500-907 (Post 7/2011)	✅ YES	❌ NO
Energy Savers / General Spa Use	✅ YES (longer threads work)	✅ YES — designed for general use
Price	Higher	Lower

⚠️ Pre-2011 vs Post-2011 Sundance Pump Selection

Your Existing Part Number	Date Range	Correct Replacement
6500-907 (post 7/11/2011)	07/2011 and newer	✅ WTC50M-USA (THIS PUMP)
6000-907 (pre 7/11/2011)	Before 07/2011	❌ Use 48WTC0153C-I instead
6500-913	Various	✅ WTC50M-USA (THIS PUMP)
6500-905	Various	✅ WTC50M-USA (THIS PUMP)
6500-920	Various	✅ WTC50M-USA (THIS PUMP)

Also Replaces Previous Pump Models

The WTC50M-USA replaces the older Aqua-Flo TheraMax II (model 02410512-2) circulation pump that was originally factory-installed in many Sundance and Jacuzzi spas.

LX Lingxiao WTC50M Circulation Pump Family

Model	Thread Length	Voltage	HP	Amps	Sundance/Jacuzzi Replacement	Notes
WTC50M-USA (THIS PUMP)	Longer (USA/Sundance)	230V	0.35	1.0A	✅ Yes (Post 7/2011)	Longer snout for Sundance/Jacuzzi 6500-907
WTC50M-STANDARD	Shorter (Standard)	230V	0.35	1.0A	❌ No	General use — Energy Savers, Water’s Edge, etc.
WTC50MLS	Long Snout	230V	0.35	1.0A	✅ Yes	Long snout variant
48WTC0153C-I	Standard	115/230V	1/15	Varies	✅ Yes (Pre 7/2011 only)	Older dual-voltage model — for 6000-907
WCP250G	Standard	230V	0.35	—	—	Can replace WTC50M identically

Wet End Rotation Instructions

The pump ships with the discharge in the 12 o’clock position (the position used by Sundance spas). To rotate for your application, loosen the 4 thru-bolts on the motor side, turn the wet end to the needed position (12, 3, 6, or 9 o’clock), and retighten the bolts. Ensure proper o-ring alignment during reassembly.

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📐 Alternate Part Numbers

Primary Model Numbers

Part Number	Notes
WTC50M-USA	Primary LX model number — longer threads for Sundance/Jacuzzi
WTC50M	Base model designation

Sundance / Jacuzzi OEM Part Numbers

Part Number	Notes
6500-907	Primary Sundance/Jacuzzi OEM — Post 7/11/2011 models
6500-913	Sundance/Jacuzzi OEM variant
6500-905	Sundance/Jacuzzi OEM variant
6500-920	Sundance/Jacuzzi OEM variant
6500-903	Sundance/Jacuzzi OEM variant
SD6500-907 / SD6500907	Alternate format for 6500-907
SD6500-913 / SD6500913	Alternate format for 6500-913
SD6500-903 / SD6500903	Alternate format for 6500-903

Older Sundance OEM (Pre-2011 — Use 48WTC0153C-I Instead)

Part Number	Notes
6000-907	Older Sundance OEM — Pre 7/11/2011 models — requires 48WTC0153C-I, NOT this pump
SD6000-907 / SD6000907	Alternate format for 6000-907

Industry / Distributor Cross-Reference Numbers

Part Number	Notes
34-343-1075	Industry cross-reference
1-00-0054	Distributor cross-reference
SPPRT2748	Distributor SKU
3508234	Distributor product code
M05CTW	Manufacturer code variant
ACM0846	Manufacturer code variant
JAPU5	Manufacturer code variant

Without Dashes (Search Variants)

Part Number	Notes
6500907	No-dash variant of 6500-907
6000907	No-dash variant of 6000-907
6500913	No-dash variant of 6500-913
6500903	No-dash variant of 6500-903

Related Accessories / Adapters

Part Number	Description	Notes
402223	AMP cord for 1-speed pump	Power cord — NOT included with pump
21086	60-inch power cord	Alternate cord option
6540-171	Stainless steel freeze line adapter/hose barb	For freeze protection tubing
6540-263	O-ring for freeze line adapter	For 6540-171 barb fitting
27241-004-000	Vibration pad/mat	For use with STANDARD version to match USA height — not needed with this pump

Replacement Components

Component	Part Number	Notes
Impeller	A03070053 / 15-0050LX	LX WTC50M impeller — 105mm diameter, 6 vanes
Complete Wet End	WTC50M wet end (order as “WTC50M wet end”)	Includes impeller, seal, faceplate, o-ring — fits all WTC50M variants
Mechanical Seal	WTC50M-MSS (aftermarket)	Carbon ceramic — synthetic rubber
Seal Kit	Available from SpaCare and other retailers	For 6500-907 LX circulation pump specifically
Faceplate O-Ring	Available separately (LX standard)	Consult retailer for LX-specific o-ring

⚠️ Wet End Note: LX only manufactured one WTC50M wet end design. The replacement wet end fits all WTC50M variants (USA, Standard, MLS). It includes impeller, shaft seal, faceplate, and o-ring — bolts directly onto the motor.

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🛠️ Installation Requirements

Mounting

Requirement	Specification
Mounting Position	Horizontal — below water level (flooded suction)
Base	Level surface with adequate drainage
Mounting Holes	Approximately 3-1/2″ center-to-center front-to-back, 4-3/8″ center-to-center side-to-side
Mounting Base	Updated to single-piece reinforced engineering plastic base (replaces older small-feet design)
Ventilation	Protect motor from excessive moisture; ensure adequate airflow

⚠️ Mounting Hole Note: The mounting hole pattern on the new WTC50M-USA may not align exactly with your old pump’s mounting holes. You may need to drill new holes in the mounting base/floor. The updated single-piece base replaces the older small-feet design that was prone to breaking in transit.

Plumbing

Connection	Size	Notes
Suction (Center)	1-1/2″ MBT (2-3/8″ OD)	Center intake
Discharge (Side)	1-1/2″ MBT (2-3/8″ OD)	Side discharge — rotatable
Unions	✅ INCLUDED (2 pcs with O-rings)	1-1/2″ pump unions

Installation Notes

⚠️ Flooded Suction Required: Pump must be installed below water level.

⚠️ Never Run Pump Dry: Ensure the pump is primed and filled with water before starting. Running dry will destroy the mechanical seal.

⚠️ Wet End Rotation: The pump ships with discharge at 12 o’clock (Sundance position). To change, loosen the 4 thru-bolts on the motor side, rotate the wet end to the desired position (12, 3, 6, or 9 o’clock), and retighten.

⚠️ Wiring: Reuse your existing pump’s wiring. Connect White wire to “N” (Neutral/Common), Black wire to “L” (Line/Load), and Green wire to the ground screw. The wiring diagram is printed on the side of the motor.

⚠️ Cord NOT Included: Reuse the cord from your existing pump or purchase separately. AMP cord 402223 or 60-inch cord 21086 are compatible options.

⚠️ Freeze Protection Barb: The 3/8″ barbed fitting sometimes found on the front of the wet end (for freeze protection tubing) is NOT included. If your installation requires this fitting, order it separately (6540-171 with o-ring 6540-263).

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

⚠️ Bonding & Grounding Required: Connect appropriate bonding and grounding conductors per NEC requirements.

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🔧 Maintenance Guide

Routine Maintenance

Task	Frequency	Notes
Check for leaks	Monthly	Inspect around seal area, unions, and wet end
Inspect union connections	Monthly	Hand-tighten if needed — do NOT over-tighten
Verify water circulation	Weekly	Confirm water movement through return lines
Keep motor area dry and clean	Quarterly	Protect from excessive moisture and debris
Check amperage draw	Annually	Should read approximately 1.0A at 230V
Verify GFCI operation	Monthly	Press test button to confirm proper function
Inspect mounting base	Quarterly	Ensure base is secure and pump is level

Warning Signs — Replace Pump If:

• Unusual noise (grinding, screeching, or humming without rotation)
• Water leaking from seal area between motor and wet end
• Motor repeatedly trips circuit breaker or GFCI
• No water flow when pump is running (may cause FLO error on spa pack)
• Motor overheating or burning smell
• Excessive vibration even on solid mounting
• Intermittent pump startup failure (may indicate worn bearings or failing motor)

Seal Replacement

Detail	Specification
Seal Type	Mechanical seal — carbon ceramic with synthetic rubber
Replacement Seal	WTC50M-MSS or LX-compatible mechanical seal kit

⚠️ Replace mechanical seal at first sign of water leaking from between the motor and wet end. Alternatively, the complete wet end assembly can be ordered, which includes a new seal, impeller, faceplate, and o-ring.

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🎯 Ideal Applications

Application	Suitability	Notes
♨️ Sundance spas (Post 7/2011)	✅ Yes — Primary application	Direct 6500-907 replacement — longer threads required
♨️ Jacuzzi spas (J-300/J-400/J-500/J-LX series)	✅ Yes — Confirmed compatible	See Jacuzzi model chart above for year requirements
♨️ Hot tub 24-hour circulation (general)	✅ Yes	Works in any spa with 1-1/2″ MBT plumbing at 230V
♨️ Energy Savers / Water’s Edge / other spas	✅ Yes (but longer threads unnecessary)	WTC50M-STANDARD may be more economical
♨️ Sundance spas (Pre 7/2011)	❌ No — Different model needed	Use 48WTC0153C-I for older 6000-907
♨️ 115V spa installations	❌ No — Wrong voltage	Use 48WTC0153C-I (dual voltage 115/230V) instead
♨️ Spas with 2″ plumbing	❌ No — Wrong port size	WTC50M is 1-1/2″ only
♨️ Jet pump replacement	❌ No	This is a low-HP circulation pump, NOT a jet pump
🛁 Whirlpool bath	See application notes	May work in some jetted bath applications

❓ Frequently Asked Questions

Q: Will this replace my Sundance 6500-907 circulation pump? A: Yes — if your pump is dated post 7/11/2011. The WTC50M-USA is the direct replacement for Sundance/Jacuzzi part number 6500-907 with the correct longer thread length. If you have the older 6000-907 (pre-2011), use the 48WTC0153C-I instead.

Q: Will this fit my Jacuzzi J-365 (or other J-series)? A: Yes — the WTC50M-USA is confirmed compatible with all J-375/J-365/J-355/J-345/J-335 models (2012+), all J-400 models except J-415 (1/26/2012+), J-415 (10/2/2013+), all J-500 (2015+), and J-LX/J-LXL (2011+).

Q: What is the actual horsepower of this pump? A: The actual power rating is 0.35 HP / 250 watts. Different retailers list this pump as 1/3 HP, 1/15 HP, 1/8 HP, or 1/5 HP depending on the rating method used. They all refer to the same pump. For replacement matching, use amperage (1.0A at 230V) rather than HP rating.

Q: What is the difference between WTC50M-USA and WTC50M-STANDARD? A: The only difference is the connection thread length. The USA has longer threads (longer snout) designed specifically for Sundance/Jacuzzi spas. The STANDARD has shorter threads suitable for most other spa brands. Thread pitch, thread type, and union size are identical.

Q: Are unions included? A: Yes — 2 pump unions with O-rings (1-1/2″) are included in the box.

Q: Is a cord included? A: No — the power cord is NOT included. Reuse your existing cord from the old pump. If needed, compatible AMP cords include part number 402223 or 60-inch cord 21086.

Q: The discharge doesn’t point the right way — how do I rotate it? A: The pump ships with the discharge at 12 o’clock (standard Sundance position). To rotate, loosen the 4 thru-bolts on the motor side, turn the wet end to the needed position (12, 3, 6, or 9 o’clock), and retighten. Some Jacuzzi models may need a 90-degree rotation.

Q: This pump has a 115V-style plug — can I plug it into a wall outlet? A: Absolutely not. This is a 230V pump. The 115V-style plug is used by some hot tub control systems. You should reuse your existing pump’s wiring connections.

Q: What is the flow rate? A: Multiple retailers list this pump at 35 GPM. LX Lingxiao rates the WTC50M series at 63 GPM on some listings. This variance may reflect different test conditions.

Q: The mounting holes don’t line up with my old pump. Is this normal? A: Yes — the mounting base has been updated to a single-piece design (replacing the older small-feet design). You may need to drill new mounting holes or reposition the pump base. The bottom mounting holes are approximately 3-1/2″ center-to-center front-to-back and 4-3/8″ center-to-center side-to-side.

Q: What about the 3/8″ barbed fitting on the wet end? A: The barbed fitting for freeze protection tubing is NOT included. If your installation requires this fitting, order it separately (6540-171 with o-ring 6540-263).

Q: My spa is showing a FLO error — is the circ pump bad? A: A FLO error can indicate a failing circulation pump, especially if accompanied by intermittent startup failures or unusual noise. However, FLO errors can also be caused by dirty filters, air locks, or flow sensor issues. Replacing the circ pump often resolves persistent FLO errors in Sundance and Jacuzzi spas.

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

Q: What warranty is included? A: 1-year manufacturer’s limited warranty. Contact Parts4Tubs for full warranty terms and support.

🏆 Why Choose the LX WTC50M-USA

✅ Direct Sundance / Jacuzzi Replacement — Longer threads engineered specifically for 6500-907 fitment in post-2011 Sundance and Jacuzzi spas

✅ Ultra-Quiet Operation — 1700 RPM circulation at only 1.0 amp — barely audible during continuous 24-hour operation

✅ Energy Efficient — 0.35 HP / 250W draws minimal power for significant electricity savings during 24/7 duty

✅ Unions with O-Rings INCLUDED — No separate purchase required

✅ Pure Copper Motor Winding — Superior heat dissipation for extended motor life

✅ Mechanical Seal — Watertight performance designed for continuous operation

✅ 4-Position Rotatable Wet End — 12, 3, 6, and 9 o’clock positions for flexible plumbing alignment

✅ Proven Customer Satisfaction — Hundreds of positive reviews from Sundance and Jacuzzi owners confirming easy installation and reliable operation

✅ UL Certified — Tested and approved for the US market

✅ 1-Year Manufacturer’s Warranty — Backed by LX Lingxiao

🤝 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

✅ Compatible cords, adapters, and replacement parts available

✅ Dedicated customer service team

💧 Summary

The LX Lingxiao WTC50M-USA is a 0.35 HP (250W), 230V/60Hz, single-speed, 48-frame circulation pump with longer connection threads designed as the direct replacement for Sundance and Jacuzzi OEM part number 6500-907 (post 7/11/2011). Features side discharge and center suction, both 1-1/2″ MBT (2-3/8″ OD). Draws only 1.0 amp at 230V for ultra-quiet, energy-efficient 24-hour operation at 1700 RPM. Pure copper motor winding, mechanical seal (carbon ceramic), and reinforced engineering plastic base with updated single-piece design. Confirmed compatible with Sundance Select/880/Aspen/780 Series (2011-2013+) and Jacuzzi J-300/J-400/J-500/J-LX/J-LXL Series (2011-2015+). Also replaces 6500-913, 6500-905, 6500-920, 6500-903, and older Aqua-Flo TheraMax II pumps. Extensive alternate part numbers include SD6500-907, 34-343-1075, 1-00-0054, SPPRT2748, 3508234, M05CTW, ACM0846, and JAPU5. Wet end rotates in 4 positions (12, 3, 6, 9 o’clock). Two 1-1/2″ pump unions with O-rings INCLUDED. Cord NOT included (reuse existing). Dimensions: 11-7/8″ × 6-1/2″ × 7-11/16″. Replacement components available: impeller A03070053/15-0050LX, complete wet end, and mechanical seal. UL Certified. 1-year manufacturer’s limited warranty. Available now at Parts4Tubs.

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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: 586 Min: 1 Step: 1 Add to cart
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	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: 150 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.