Sundance / Jacuzzi 6500-907 LX WTC50M Spa Circulation Pump — 0.35 HP 230V 1-Speed 48-Frame 1-1/2″ MBT | OEM Replacement

�� Sundance / Jacuzzi 6500-907 LX WTC50M Spa Circulation Pump — 0.35 HP 230V 1-Speed 48-Frame 1-1/2″ MBT | OEM Replacement Factory-spec OEM circulation pump for 2011 Sundance and Jacuzzi spas — direct replacement for part number 6500-907 �� Product Overview The 6500-907 is the OEM Sundance / Jacuzzi circulation pump — an LX Lingxiao WTC50M rated at 0.35 HP (250W), 230V/60Hz, single-speed, 48-frame with 1-1/2″ MBT connections and side discharge. This is the current-version (2011 ) replacement for 24-hour circulation in Sundance and Jacuzzi spas. The pump is manufactured by LX Lingxiao (Powerful Water Technology Limited) and features the longer connection threads (longer snout) required by Sundance and Jacuzzi spa plumbing — the same pump as the WTC50M-USA. It delivers 35 GPM with a pure copper motor winding for excellent cooling and extended motor life, and a mechanical seal for watertight continuous operation. The wet end features a side discharge and center suction, and can be rotated to 4 positions (12, 3, 6, and 9 o’clock) — the pump ships with discharge at 12 o’clock (Sundance default position). The reinforced engineering plastic base with updated single-piece design provides vibration resistance and corrosion resistance. The pump draws just 1.0 amp at 230V for minimal energy consumption during 24/7 operation. Backed by a 1-year manufacturer’s limited warranty. ⚠️ Unions NOT Included: This OEM-spec version (SKU: 6500-907) does NOT include pump unions. If you need unions included, consider the WTC50M-USA version which includes 2 pump unions with O-rings. Reuse your existing unions from the old pump, or purchase replacement unions separately. ⚠️ Cord NOT Included: No power cord is supplied. Reuse your existing cord from the old pump. ⚠️ 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 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 ✅ OEM Sundance / Jacuzzi 6500-907 Replacement — Factory-spec circulation pump for 2011 Sundance and Jacuzzi spas ✅ 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 ✅ Longer Threads (USA/Sundance Spec) — Correct thread length for direct Sundance and Jacuzzi fitment ✅ Pure Copper Motor Winding — Superior cooling efficiency and extended motor life ✅ Mechanical Seal — Watertight operation for long-term continuous duty ✅ 4-Position Rotatable Wet End — 12, 3, 6, and 9 o’clock positions to match your existing plumbing ✅ 35 GPM Flow Rate — Reliable circulation for water quality and heating efficiency ✅ 48-Frame Design — Standard mounting compatible with Sundance and Jacuzzi pump compartments ✅ Reinforced Engineering Plastic Base — Updated single-piece design — vibration-resistant and corrosion-resistant ✅ 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) OEM Part Number 6500-907 (Sundance / Jacuzzi) LX Model WTC50M (USA / long-thread version) 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 Flow Rate 35 GPM Frame Type 48 Frame 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 Longer threads / longer snout (Sundance/Jacuzzi spec) 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 — 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 ❌ NOT INCLUDED — reuse existing or purchase separately Cord ❌ NOT INCLUDED — reuse existing cord Freeze Protection Barb NOT INCLUDED — 3/8″ barbed fitting sold separately if needed Certifications UL Certified Warranty 1-Year Manufacturer’s Limited Warranty ⚠️ Plug Note: This pump may come with a 115V-style wall plug — however, it cannot be used on a standard 115V wall outlet. This is a 230V pump. Reuse your existing pump’s wiring connections. The wiring diagram is printed on the side of the motor. ⚡ 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 Simply unwire your original pump and connect the wire tabs back to this pump using the same connections. ⚠️ 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. Using the wrong voltage will damage the motor. �� 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 ⚠️ 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 ✅ This pump (6500-907 / WTC50M-USA) 6000-907 (pre 7/11/2011) Before 07/2011 ❌ Use 48WTC0153C-I instead 6500-913 Various ✅ This pump 6500-905 Various ✅ This pump 6500-920 Various ✅ This pump Also Replaces Previous Pump Models The 6500-907 / WTC50M replaces the older Aqua-Flo TheraMax II (model 02410512-2) circulation pump that was originally factory-installed in many Sundance and Jacuzzi spas. 6500-907 vs WTC50M-USA vs WTC50M-STANDARD — Which to Choose? Feature 6500-907 (THIS PUMP) WTC50M-USA WTC50M-STANDARD Thread Length Longer (Sundance/Jacuzzi spec) Longer (same as 6500-907) SHORTER threads Unions Included ❌ NO — unions NOT included ✅ YES — 2 unions with O-rings ✅ YES — 2 unions Cord Included ❌ NO ❌ NO ❌ NO Sundance / Jacuzzi Compatible ✅ YES — OEM part number ✅ YES — same pump ❌ NO — threads too short Same Pump? ✅ Same as WTC50M-USA ✅ Same as 6500-907 ❌ Different thread length Best For Owners reusing existing unions Owners needing new unions Non-Sundance/Jacuzzi spas �� TIP: This pump (6500-907) and the WTC50M-USA are the same pump — the only difference is that the WTC50M-USA listing includes unions and O-rings in the box. If your existing unions are in good condition, you can reuse them with this pump. If you need new unions, consider the WTC50M-USA instead. LX Lingxiao WTC50M Circulation Pump Family Model Thread Length Voltage HP Amps Sundance/Jacuzzi Notes 6500-907 / WTC50M-USA (THIS PUMP) Longer (Sundance spec) 230V 0.35 1.0A ✅ Yes (Post 7/2011) OEM replacement — longer snout 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 (standard Sundance position). To rotate, loosen the 4 thru-bolts on the motor side using a 7mm socket wrench, turn the wet end to the needed position (12, 3, 6, or 9 o’clock), and retighten. The pump intake (suction) is located in the front center face of the pump. Ensure proper o-ring alignment during reassembly. �� Alternate Part Numbers Sundance / Jacuzzi OEM Part Numbers Part Number Notes 6500-907 Primary Sundance/Jacuzzi OEM — Post 7/11/2011 models (THIS PUMP) 6500-913 Sundance/Jacuzzi OEM variant — also replaced by this pump 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 LX Lingxiao Model Numbers Part Number Notes WTC50M-USA LX aftermarket designation — same pump as 6500-907, with unions included WTC50M Base LX model designation WTC50M-A LX variant designation 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 6500905 No-dash variant of 6500-905 Related Accessories Part Number Description Notes 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 402223 AMP cord for 1-speed pump If cord replacement is needed 21086 60-inch power cord Alternate cord option Replacement Components Component Part Number Notes Impeller A03070053 / 15-0050LX LX WTC50M impeller — 105mm diameter, 6 vanes Complete Wet End WTC50M wet end / 02410512-2 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 multiple retailers For 6500-907 LX circulation pump specifically Faceplate O-Ring Available separately (LX standard) Consult retailer for LX-specific o-ring ��️ 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 single-piece reinforced engineering plastic base Ventilation Protect motor from excessive moisture; ensure adequate airflow ⚠️ Mounting Hole Note: The mounting hole pattern on the new pump may not align exactly with your old pump’s mounting holes. You may need to relocate or modify the mounting bolt position on your spa floor. The updated single-piece base replaces the older small-feet design. Plumbing Connection Size Notes Suction (Center) 1-1/2″ MBT (2-3/8″ OD) Center intake — front face of pump Discharge (Side) 1-1/2″ MBT (2-3/8″ OD) Side discharge — rotatable (ships at 12 o’clock) Unions ❌ NOT INCLUDED Reuse existing unions from old pump or purchase separately Installation Steps (Sundance / Jacuzzi Specific) Drain spa and disconnect power at the breaker Disconnect wiring from old pump — note wire positions (White=N, Black=L, Green=Ground) Disconnect plumbing unions from old pump Remove old pump from mounting base Position new pump — rotate wet end if needed (loosen 4 thru-bolts with 7mm socket wrench) Mount pump to base — drill new mounting holes if needed Reconnect plumbing — reuse existing unions, ensure O-rings are in good condition Reconnect wiring — White to “N”, Black to “L”, Green to ground screw Fill spa and check for leaks before restoring power Restore power and verify pump operation 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: Loosen the 4 thru-bolts on the motor side with a 7mm socket wrench, rotate to desired position, and retighten. ⚠️ Unions NOT Included: Reuse your existing pump unions. Inspect O-rings during reinstallation and replace if worn or cracked. ⚠️ Freeze Protection Barb: The 3/8″ barbed fitting (for freeze protection tubing) is NOT included. Order 6540-171 with O-ring 6540-263 separately if needed. ⚠️ GFCI Protection Required: All spa installations require GFCI protection per the NEC. ⚠️ Bonding & Grounding Required: Connect appropriate bonding and grounding conductors per NEC requirements. �� 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 (common sign of 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. �� Ideal Applications Application Suitability Notes ♨️ Sundance spas (Post 7/2011) ✅ Yes — Primary application OEM 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 ♨️ Sundance spas (Pre 7/2011) ❌ No — Different model needed Use 48WTC0153C-I for older 6000-907 ♨️ Non-Sundance/Jacuzzi spas (shorter threads) ⚠️ Works but unnecessary WTC50M-STANDARD is more economical for shorter-thread applications ♨️ 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 ❓ Frequently Asked Questions Q: Is this the same pump as the WTC50M-USA? A: Yes — identical pump. The 6500-907 is the OEM Sundance/Jacuzzi part number for the same LX WTC50M-USA pump. The only difference in the Parts4Tubs listings is that the WTC50M-USA SKU includes unions, while this 6500-907 SKU does NOT include unions. Choose whichever listing suits your needs — if your existing unions are in good condition, this listing saves the cost of unnecessary unions. Q: Will this fit my Sundance spa? A: Yes — if your spa is dated post 7/2011. Compatible with Sundance Select Series (07/2011 ), 880 Series (07/2011 ), Aspen (2012 ), 780 Certa/Montclair (04/2013 ), and 780 Hamilton/Chelsee (03/2013 ). If you have a pre-2011 Sundance with part number 6000-907, use the 48WTC0153C-I instead. Q: Will this fit my Jacuzzi J-365 (or other J-series)? A: Yes — confirmed compatible with J-375/J-365/J-355/J-345/J-335 (2012 ), J-400 except J-415 (1/26/2012 ), J-415 (10/2013 ), J-500 (2015 ), and J-LX/J-LXL (2011 ). Q: Are unions included? A: No — unions are NOT included with this 6500-907 SKU. Reuse your existing unions from the old pump. If you need new unions included, purchase the WTC50M-USA version instead, which comes with 2 unions and O-rings. Q: Is a cord included? A: No — the power cord is NOT included. Reuse your existing cord from the old pump. Q: What is the actual horsepower? 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. They all refer to the same pump. For replacement matching, use amperage (1.0A at 230V). Q: The discharge doesn’t point the right way — how do I rotate it? A: The pump ships with discharge at 12 o’clock (standard Sundance position). Loosen the 4 thru-bolts on the motor side with a 7mm socket wrench, turn the wet end to 12, 3, 6, or 9 o’clock, and retighten. Some Jacuzzi models may need 90-degree rotation. Q: My spa is showing a FLO error — is the circ pump bad? A: A FLO error can indicate a failing circulation pump, especially with intermittent startup failures or unusual noise. However, FLO errors can also result from dirty filters, air locks, or flow sensor issues. Replacing the circ pump often resolves persistent FLO errors in Sundance and Jacuzzi spas. Q: The mounting holes don’t line up. Is this normal? A: Yes — the mounting base has been updated to a single-piece design. You may need to relocate or modify the mounting bolt position on your spa floor. The bottom mounting holes are approximately 3-1/2″ × 4-3/8″ center-to-center. Q: What about the 3/8″ barbed fitting on the wet end? A: The barbed fitting for freeze protection tubing is NOT included. Order 6540-171 with O-ring 6540-263 separately if needed. Q: I have the older 6000-907 — will this work? A: No. The 6000-907 is the pre-7/2011 Sundance part number which requires the 48WTC0153C-I (older dual-voltage LX circulation pump), NOT the WTC50M/6500-907. 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 6500-907 / WTC50M ✅ Factory OEM Replacement — Exact Sundance/Jacuzzi part number 6500-907 for guaranteed fitment in 2011 models ✅ Proven Sundance & Jacuzzi Compatibility — Confirmed in Select, 880, 780 Series Sundance and J-300/J-400/J-500/J-LX Jacuzzi models ✅ 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 ✅ 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 — ships in Sundance default position ✅ Easy Installation — Same wiring connections (N/L/Ground), same plumbing unions, same mounting location ✅ 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 ✅ Replacement seals, wet ends, and accessories available ✅ Dedicated customer service team ✨ Summary The Sundance / Jacuzzi 6500-907 is the OEM circulation pump for 2011 Sundance and Jacuzzi spas — an LX Lingxiao WTC50M rated at 0.35 HP (250W), 230V/60Hz, single-speed, 48-frame with 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 with 35 GPM flow. Features longer connection threads for Sundance/Jacuzzi fitment, pure copper motor winding, mechanical seal (carbon ceramic), and reinforced engineering plastic base with updated single-piece design. This is the same pump as the WTC50M-USA — the only difference is that unions are NOT included with this 6500-907 SKU (reuse your existing unions). 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 cross-references include SD6500-907, 34-343-1075, 1-00-0054, SPPRT2748, 3508234, M05CTW, ACM0846, and JAPU5. Wet end rotates in 4 positions with 7mm socket wrench. Cord NOT included (reuse existing). Wiring: White→N, Black→L, Green→Ground. Dimensions: 11-7/8″ × 6-1/2″ × 7-11/16″. UL Certified. 1-year manufacturer’s limited warranty. Available now at Parts4Tubs. Showing 1 – 5 of 5 results Showing all 5 results Showing the single result No results found Sort by Price low to high Sort by Popularity Sort by Rating Sort by Price low to high Sort by Price high to low Sort by Newness Sort by Name A - Z Sort by Name Z - A Filters Sort results Reset Apply Magic Plastics Union 0602-15 (1.5″ Pump Union) | 1-1/2″S x 1-1/2″FBTUnion, Pump, Magic, 1-1/2"S x 1-1/2"FBT (Industry Standard) w/ O-Ring $6.36 Max: 475 Min: 1 Step: 1 Add to cartMagic Plastics Union 0602-20 (2″ Pump Union) | 2″S x 2″FBT w/ O-RingUnion, Pump, Magic, 2"S x 2"FBT (Industry Standard) w/ O-Ring $8.00 Max: 959 Min: 1 Step: 1 Add to cartWaterway 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: 146 Min: 1 Step: 1 Add to cart1 Speed Pump / Blower / AMP Cord | 21086Amp Plug, Pump, 1-Speed, 14/3, 4-Pin, 5' Cord, White $24.71 Max: 432 Min: 1 Step: 1 Add to cartBalboa Amp Plug 21087 (For 2 Speed Pumps)Amp Plug, Pump 1 (2-Speed) 14/4, 72" Long, White $31.72 Max: 216 Min: 1 Step: 1 Add to cart Hot Tub Pump Collar & Union Size Chart Hot Tub Pump Collar & Union Size Chart Imperial & Metric Specifications Union Size Collar Size Thread OD Union OD O-Ring Size 1.5" Female ButtressThread (FBT) 2.5" / 64mm (Tip to Tip)Measurement 2-1/2" 64mm 2-13/16" 71mm 2-5/16" OD 59mm 2" Female ButtressThread (FBT) 3.1" / 78mm (Tip to Tip)Measurement 3-1/16" 78mm 3-3/8" 81mm 2-15/16" OD 75mm 2.5" Female ButtressThread (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: 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.