🔄 LX Lingxiao 56WUA350-II Spa Pump — 3.5 HP 2-Speed 230V 56-Frame | Dual Speed Jet Pump for Hot Tubs

High-speed for powerful massage jets, low-speed for quiet filtration — one pump, two essential functions

💧 Product Overview

The LX Lingxiao 56WUA350-II is a 3.5 HP dual-speed jet pump from Guangdong Lingxiao Pump Industry Co., Ltd. (LX), designed specifically for spa and hot tub usage in North America. Operating at 230V/60Hz, this pump draws 11.0 Amps on high speed for powerful jet massage and 3.5 Amps on low speed for quiet filtration and circulation — eliminating the need for a separate circulation pump in many spa configurations. The pump features a 56-frame thru-bolt motor with 2″ MBT (Male Buttress Thread) center suction and 2″ MBT side discharge ports, with an outside thread diameter of 3-1/16″ connecting to standard 2″ inner diameter spa plumbing. The WUA series is the most popular aftermarket spa pump line in North America, recognized and accepted by spa manufacturers as a proven replacement for Gecko Aqua-Flo, Waterway, and Balboa Vico pumps with matching specifications. LX Lingxiao has been designing and manufacturing pumps for over 46 years. The 56WUA350-II features a pure copper winding motor for long service life, Class F insulation with thermal protection, IPX5 moisture protection, mechanical seal for watertight continuous operation, anti-creep bearings with high-temperature grease for quiet operation, and a fan-cooled motor design. This pump ships with two 2″ unions included but does NOT include a pump cord — you will need to reuse your existing 4-wire 2-speed AMP cord or purchase one separately. The pump housing can be rotated 90° for flexible plumbing configurations. This dual-speed pump can also be wired as a single-speed pump by connecting only the high-speed terminal and leaving low speed unconnected. ETL/CETL certified for the North American market. Backed by Lingxiao’s 1-year manufacturer warranty.

⭐ Key Features

✅ 3.5 HP Dual Speed — 11.0A High / 3.5A Low @ 230V/60Hz — Full jet power on high speed with quiet, energy-efficient circulation on low speed

✅ Eliminates Separate Circulation Pump — Low speed provides sufficient flow for heater circulation and filtration, reducing plumbing complexity and cost

✅ 56-Frame Thru-Bolt Motor — Larger motor runs cooler and quieter than 48-frame equivalents for longer service life

✅ Pure Copper Winding Motor — Higher conductivity for efficient operation, longer lifespan, and cooler running temperatures

✅ 2″ MBT Center Suction / 2″ Side Discharge — Standard 2″ Male Buttress Thread connections (3-1/16″ outer thread diameter) for 2″ inner diameter plumbing

✅ Mechanical Seal — Ensures watertight operation during continuous duty cycles in hot tub environments

✅ Class F Insulation with Thermal Protector — Advanced insulation rated to 155°C with automatic thermal overload protection

✅ IPX5 Moisture Protection — Motor enclosure rated against water jets from any direction

✅ Rotatable Wet End — Pump housing can be rotated 90° for flexible installation and plumbing alignment

✅ Anti-Creep Bearings — High-temperature grease bearings designed for quiet, long-lasting operation

✅ Unions Included — Two 2″ unions with O-rings provided for quick plumbing connections

✅ ETL/CETL Certified — Independently tested and listed for the North American market (US and Canada)

✅ Versatile Wiring — Can be wired as 2-speed (4-wire) or single-speed (3-wire, high speed only)

🔩 Technical Specifications

Specification	Value
Manufacturer	Guangdong Lingxiao Pump Industry Co., Ltd. (LX)
Brand	LX / Lingxiao / Intertek LX
Model	56WUA350-II
Pump Series	WUA (Spa & Pool Pump)
Horsepower	3.5 HP
Speed Settings	2-Speed (Dual Speed)
Voltage	230V (220-240V)
Frequency	60 Hz
High Speed Amperage	11.0 Amps
Low Speed Amperage	3.5 Amps
Frame Type	56 Frame Thru-Bolt
Motor Type	Fan-cooled, pure copper winding, dual speed
Bearing Type	Anti-creep bearings with high-temperature grease
Discharge Location	Side
Discharge Size	2″ MBT (Male Buttress Thread)
Suction Size	2″ MBT (Male Buttress Thread)
Suction Style	Center
Outside Thread Diameter	3-1/16″ (connects to 2″ inner diameter plumbing)
Seal Type	Mechanical seal
Insulation Class	Class F (155°C)
Thermal Protection	Yes — automatic thermal protector
Enclosure Protection	IPX5
Duty	Continuous
Drain Plug Location	3, 6, 9 o’clock positions
Standard Wet End Position	12 o’clock (UP position) — rotatable 90°
Dimensions (L × W × H)	16-7/16″ × 8-3/4″ × 8-7/8″
Cord	NOT INCLUDED — use existing 4-wire 2-speed AMP cord or purchase separately
Unions	INCLUDED — 2× 2″ unions with O-rings
Certifications	ETL, CETL (Intertek listed)
Warranty	1-year manufacturer warranty (Lingxiao)
Country of Origin	China (Guangdong Lingxiao Pump Industry Co., Ltd.)

⚠️ Motor Brand Note: Pump and motor manufacturers reserve the right to change motors or style of motor without notice. Motors shown may differ from current stocked product. Functionality remains the same.

⚠️ HP Rating Note: When matching replacement pumps, always compare by amperage rather than horsepower. HP ratings on spa pumps are often listed using different rating methods (SPL-HP, BHP, continuous duty HP) which do not represent the same thing. This pump draws 11.0A on high speed and 3.5A on low speed — use these amperage values for accurate matching.

⚡ Electrical Requirements

Electrical Spec	Requirement
Supply Voltage	230V (220-240V)
Frequency	60 Hz
Phase	Single Phase
High Speed Amperage	11.0 A
Low Speed Amperage	3.5 A
Insulation Class	Class F (155°C)
Thermal Protection	Automatic thermal protector
Enclosure	IPX5
Cord	NOT INCLUDED — requires 4-wire 2-speed AMP cord

2-Speed Wiring Terminals

Terminal	Function	Typical Wire Color
C	Common	White
H	High Speed	Red (occasionally Black)
L	Low Speed	Black (occasionally Red)
Ground	Equipment Ground	Green

💡 Wiring Verification: When the pump first powers up, it should start on LOW SPEED. If it starts on HIGH speed instead, power down immediately and reverse the Red and Black wires, then power up again and verify it goes into low speed first. Running in the wrong speed configuration can cause overheating and damage.

💡 Single-Speed Wiring Option: This 2-speed pump can be wired as a single-speed pump by connecting only the high-speed terminal (H) and leaving the low-speed terminal (L) unconnected. Use a 3-wire single-speed pump cord instead of a 4-wire 2-speed cord.

💡 Motor Terminal Posts: Posts on the motor are clearly labeled per the wiring diagram on the attached pump label for correct installation of the pump cable.

⚠️ 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. This pump must be connected to a supply circuit protected by a Ground-Fault Circuit Interrupter (GFCI). A dedicated circuit is required — do not share with other appliances. Applied voltage must correspond to the rated voltage on the motor nameplate. Ensure proper grounding and bonding per NEC requirements.

💡 Cord Note: This pump does NOT include a cord. You will need to reuse your existing 2-speed pump cord or purchase a new 4-wire AMP cord separately. The motor serial number label (located on the outside of the motor, next to the red arrow) is required for all warranty claims.

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🔗 Compatibility Guide

Frame & Port Configuration

Specification	Detail
Frame	56 Frame Thru-Bolt
Suction	2″ MBT (Center)
Discharge	2″ MBT (Side)
Outside Thread Diameter	3-1/16″ (connects to 2″ ID plumbing)
Drain Plug Positions	3, 6, 9 o’clock
Wet End Position	12 o’clock (rotatable 90°)
Unions	INCLUDED — 2× 2″ unions with O-rings
Base/Feet	Footed model (has standard base/feet for floor mounting)

Compatibility Verification Checklist

Always verify compatibility by matching these critical specifications from your existing pump:

1. Frame type — must be 56 frame thru-bolt
2. Voltage — must be 230V / 60Hz
3. Amperage — should be approximately 11.0A high / 3.5A low
4. Port sizes — both suction and discharge are 2″ MBT (3-1/16″ outside thread diameter)
5. Discharge direction — side discharge
6. Speed — 2-speed (verify your spa pack has both high and low speed connections)
7. Cord type — purchase 4-wire 2-speed AMP cord separately or reuse existing

⚠️ 2-Speed vs Single Speed Note: This pump (56WUA350-II) is a DUAL-SPEED pump requiring a 4-wire pump cord (Common, High, Low, Ground). If your existing pump is single-speed and your spa pack only has a single-speed pump connection, you can either use the 1-speed version 56WUA350-I, or wire this pump as single-speed by connecting only the high-speed terminal.

⚠️ Plumbing Thread Note: The threads measure 3-1/16″ across the pump threads and connect to standard 2″ inner diameter spa plumbing (flex hose/pipe). If your spa has different size plumbing (1-1/2″ or 2-1/2″), you will need appropriate adapter fittings.

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📐 Alternate Part Numbers

Primary Designations

Part Number / Designation	Notes	Source
56WUA350-II	Primary LX Lingxiao model number (56-frame, WUA series, 3.5HP, 2-speed)	Parts4Tubs, HotTubOutpost, Pool-Spa-Supplies confirmed
LX56WUA350-II	With LX brand prefix — same pump	HotTubOutpost replaces list confirmed
56WUA350II	Without dash — same pump	HotTubOutpost replaces list confirmed
LX56WUA350II	Full brand prefix without dash — same pump	HotTubOutpost replaces list confirmed
WUA350-II	Short form without frame prefix	LX manufacturer product listing

Single-Speed Counterpart (Same Wet End Platform)

Part Number	HP	Speed	Volts/Hz	Amps	Frame	Notes
56WUA350-I	3.5 HP	1-Speed	230V/60Hz	11.0 A	56	Single-speed version — same wet end
56WUA350-II	3.5 HP	2-Speed	230V/60Hz	11.0/3.5 A	56	THIS PRODUCT

Complete LX 56WUA Family (56-Frame, 2″ MBT Ports, 230V/60Hz)

Model	HP	Speed	Amps (High/Low)	Notes
WUA200-II	2.0 HP	2-Speed	8.0/3.0 A	56-frame, 2″ MBT
56WUA300-I	3.0 HP	1-Speed	10.0 A	Replaces Aqua-Flo XP2e 3HP 1-Speed
56WUA300-II	3.0 HP	2-Speed	10.0/2.3 A	Replaces Aqua-Flo XP2e 3HP 2-Speed
56WUA350-I	3.5 HP	1-Speed	11.0 A	Single-speed counterpart
56WUA350-II	3.5 HP	2-Speed	11.0/3.5 A	THIS PRODUCT
56WUA400-I	4.0 HP	1-Speed	12.0 A	Replaces Aqua-Flo XP2e 4HP 1-Speed
56WUA400-II	4.0 HP	2-Speed	12.0/4.4 A	Replaces Aqua-Flo XP2e 4HP 2-Speed, Waterway 3721621-1D
56WUA400-2/6	4.0 HP	2-Speed (2P/6P)	12.0/1.0 A	Low-amp low speed (1150 RPM)
56WUA400-I(NF)	4.0 HP	1-Speed	12.0 A	Bracketless — Sundance/Jacuzzi
56WUA400-II(NF)	4.0 HP	2-Speed	12.0/4.4 A	Bracketless — replaces 6500-352, 6500-363, 6500-367
56WUA500-I	5.0 HP	1-Speed	15.0 A	Largest WUA single-speed
56WUA500-II	5.0 HP	2-Speed	15.0/5.0 A	2-1/2″ ports on some versions

Wet End Component

Part Number	Description	Source
A01080074	Wet end back housing part number (stamped on housing) — used on current generation 56WUA350 wet ends for both 1-speed and 2-speed	Pool and Hot Tub Depot confirmed

Impeller

Part	Description	Source
LX 3.5HP Pump Impeller for 56WUA350	Current generation impeller — fits both 56WUA350-I and 56WUA350-II. Ships in black or tan color. NOT compatible with older style wet ends — only fits wet ends with P/N A01080074 stamped on back housing.	Pool and Hot Tub Depot, HotTubOutpost confirmed

General WUA Series Cross-Reference Notes

The LX 56WUA series serves as a universal aftermarket replacement for many spa pump manufacturers. The following cross-references apply to other models in the WUA family and are documented for reference:

LX Model	Commonly Replaces	Source
56WUA300-I	Aqua-Flo XP2e 3.0HP 56-frame 1-speed	BathParts, Pool-Spa-Supplies confirmed
56WUA300-II	Aqua-Flo XP2e 3.0HP 56-frame 2-speed, Waterway 3721221-1D, 3721621-1W	Pool-Spa-Supplies, SpaGuts confirmed
56WUA400-I	Aqua-Flo XP2e 4.0HP 56-frame 1-speed	Pool-Spa-Supplies confirmed
56WUA400-II	Aqua-Flo XP2e 4.0HP 56-frame 2-speed, Waterway 3721621-1D, Energy Saver 430-0052	Pool-Spa-Supplies, HotTubOutpost confirmed
56WUA400-II(NF)	Sundance/Jacuzzi 6500-352, 6500-363, 6500-365, 6500-367, HydroMaster BX4117-S2	EasySpaParts, Amazon, SpaPartsExperts confirmed

⚠️ Cross-Reference Warning for 56WUA350-II: No specific OEM or aftermarket cross-references have been independently confirmed for the 56WUA350-II (3.5HP 2-speed) model specifically. The 3.5 HP rating is less common than 3.0 HP and 4.0 HP in the spa pump aftermarket. When replacing an existing pump, always match frame size, amperage (both high and low speed), port sizes, voltage, and speed type — do not rely on HP alone.

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🛠️ Installation Requirements

Mounting

Requirement	Specification
Mounting Position	Horizontal — on a level surface
Location	Below water level recommended (flooded suction)
Surface	Level, stable surface with adequate drainage
Ventilation	Adequate clearance around motor for fan cooling airflow
Base/Feet	This pump has standard feet/base (footed model)

Plumbing

Connection	Size
Suction	2″ MBT (Center) — 3-1/16″ outside thread diameter
Discharge	2″ MBT (Side) — 3-1/16″ outside thread diameter
Unions	INCLUDED — 2× 2″ unions with O-rings
Drain Plugs	3, 6, 9 o’clock positions

Installation Notes

⚠️ Never run pump dry — causes seal and motor damage.

⚠️ Ensure proper grounding and bonding per NEC requirements.

⚠️ GFCI protection is required by code for all hot tub and spa installations.

⚠️ A dedicated circuit is required — do not share with other appliances.

⚠️ This pump does NOT include a cord. Reuse your existing 4-wire 2-speed pump cord or purchase a new AMP cord separately.

💡 Wet End Rotation: The pump housing can be rotated 90° for flexible plumbing alignment. Loosen the motor bolts, rotate the wet end to the desired discharge position, and retighten.

💡 Unions & O-rings: Use the included 2″ unions with O-rings. A small amount of plumber’s grease on the O-rings during assembly helps prevent binding and pinching.

💡 Wiring Verification: After connecting the 4-wire cord, power up the pump. It should start on LOW speed first. If it starts on HIGH speed, power down, swap the red and black wires, and re-verify.

💡 Barb Fittings: If your existing pump has a barb fitting screwed into the front of the pump housing for a hose connection, you can reuse it on this pump.

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⚙️ Maintenance Guide

Routine Maintenance

Task	Frequency	Notes
Check for leaks	Monthly	Inspect around seal area and union connections
Inspect unions and O-rings	Monthly	Hand tighten only if needed
Clean motor ventilation openings	Quarterly	Keep clear of debris for proper fan cooling
Check amperage draw	Annually	High: ~11.0A, Low: ~3.5A (within 10% of nameplate)
Verify GFCI operation	Monthly	Press test button to verify GFCI interrupts power
Inspect drain plugs	Quarterly	Verify plugs at 3, 6, 9 o’clock are secure
Verify both speeds function	Monthly	Low speed for filtration, high speed for jets

Warning Signs — Replace Pump If:

• Unusual noise (grinding, screeching, or humming without rotation)
• Water leaking from the seal area
• Motor repeatedly trips the circuit breaker
• Noticeably reduced water flow or weak jets
• Motor overheating or burning smell
• Motor hums but won’t start (capacitor failure)
• Amp draw exceeds 10% of nameplate rating on either speed
• One speed stops working while the other still functions (motor winding failure)
• Excessive vibration
• GFCI trips without test button engagement

Seal & Parts Information

Detail	Specification
Seal Type	Mechanical seal (standard LX WUA series)
Wet End Housing	P/N A01080074 (current generation, stamped on back housing)
Impeller	LX 3.5HP Impeller for 56WUA350 (current generation — fits 1-speed and 2-speed)
Drain Plug O-rings	Available separately if needed
Warranty Claims	Motor serial number label required (located on outside of motor, next to red arrow)

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🎯 Ideal Applications

Application	Suitability	Notes
♨️ Hot tub dual-speed jet pump	✅ Yes	Primary application — high speed for jets, low speed for quiet filtration/circulation
♨️ Single-pump spa systems	✅ Yes	Low speed handles filtration and heater circulation, eliminating need for separate circ pump
♨️ Multi-pump spa configurations	✅ Yes	Can serve as primary pump with both jet and filtration duties
♨️ Replacement for existing 11A/3.5A 56-frame 2-speed pumps	✅ Yes	Match frame, amperage (both speeds), port size, voltage, and discharge direction
♨️ Universal aftermarket replacement	✅ Yes	Compatible with spas using 56-frame, 2″ MBT, side discharge pumps at similar amperage
♨️ Single-speed applications (wired as 1-speed)	✅ Yes	Can be wired using high speed only with a 3-wire cord
🛁 Whirlpool bath	⚠️ Check compatibility	Verify frame, port, and electrical specifications match your system

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❓ Frequently Asked Questions

Q: What horsepower is this pump? A: This pump is rated at 3.5 HP, drawing 11.0 Amps on high speed and 3.5 Amps on low speed at 230V/60Hz. Always match by amperage rather than horsepower when selecting a replacement pump.

Q: What is the difference between the 56WUA350-II and 56WUA350-I? A: The 56WUA350-II is the DUAL-SPEED (2-speed) version drawing 11.0/3.5 Amps (high/low). The 56WUA350-I is the SINGLE-SPEED (1-speed) version drawing 11.0 Amps at one speed only. The dual-speed version is preferred for most hot tub installations because low speed provides quiet filtration and circulation while high speed delivers jet power.

Q: Is a cord included? A: No. This pump does NOT include a pump cord. You will need to reuse your existing 4-wire 2-speed pump cord or purchase a new AMP cord separately. For 2-speed operation, a 4-wire cord is required (Common, High, Low, Ground).

Q: Are unions included? A: Yes. This pump includes 2× 2″ unions with O-rings for plumbing connections.

Q: What size are the ports? A: Both suction (center) and discharge (side) are 2″ MBT (Male Buttress Thread). The outside thread diameter measures 3-1/16″ and connects to standard 2″ inner diameter spa plumbing.

Q: What voltage does this pump require? A: 230V (220-240V) / 60Hz single phase. All electrical installation must be performed by a licensed electrician.

Q: How do I wire a 2-speed pump? A: The motor terminals are clearly labeled on the pump label. C = Common (White wire), H = High Speed (usually Red), L = Low Speed (usually Black), Green = Ground. When powered up, the pump should start on LOW speed first. If it starts on high speed, power down and swap the Red and Black wires. All electrical work must be performed by a licensed electrician.

Q: Can I use this 2-speed pump as a single-speed pump? A: Yes. Connect only the high-speed terminal (H) and leave the low-speed terminal (L) unconnected. Use a 3-wire single-speed pump cord instead of a 4-wire 2-speed cord.

Q: Can this pump replace an Aqua-Flo XP2e? A: The LX 56WUA series is commonly used as a replacement for Aqua-Flo XP2e pumps with matching specifications. However, specific cross-references for the 3.5 HP 56WUA350-II have not been independently confirmed. Always verify frame size (56), port sizes (2″ MBT), voltage (230V), amperage (11.0/3.5A), and discharge direction (side) match your existing pump.

Q: Can I rotate the wet end? A: Yes. The pump housing can be rotated 90° for flexible plumbing alignment by loosening the motor bolts, rotating the wet end, and retightening.

Q: What is the warranty? A: Lingxiao provides a 1-year manufacturer warranty. The motor serial number label (located on the outside of the motor, next to the red arrow) is required for warranty claims. Contact Parts4Tubs for full warranty terms applicable to your purchase.

Q: What are the dimensions of this pump? A: The LX 56WUA series measures 16-7/16″ L × 8-3/4″ W × 8-7/8″ H. This dimension is confirmed across the entire 56WUA product line from multiple authorized retailers.

Q: How do I know if my pump needs replacing? A: Signs include unusual noise, water leaking from the seal, reduced flow, the motor tripping the breaker, motor humming but not starting, overheating, one speed failing while the other works, or excessive vibration.

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.

🏆 Why Choose the LX 56WUA350-II

✅ Dual-Speed Versatility — High speed for powerful jet massage and low speed for quiet filtration eliminates the need for a separate circulation pump

✅ Proven WUA Platform — The LX WUA series is the most popular aftermarket spa pump in North America, recognized by spa manufacturers worldwide

✅ Pure Copper Winding Motor — Higher efficiency, cooler operation, and longer motor life compared to aluminum windings

✅ 56-Frame Motor — Full-size motor runs quieter and cooler than 48-frame alternatives for longer service life

✅ Versatile Wiring — Can be wired as 2-speed or single-speed, adapting to any spa pack configuration

✅ ETL/CETL Certified — Independently tested for North American electrical safety standards

✅ 1-Year Manufacturer Warranty — Backed by Lingxiao’s 46+ years of pump manufacturing expertise

✅ Cost-Effective Replacement — High-quality dual-speed replacement at a competitive price point vs. OEM brand pumps

🤝 Why Buy From Parts4Tubs

✅ US-based support for American customers

✅ Fast shipping across the United States

✅ Expert advice from spa and hot tub specialists

✅ Competitive pricing

✅ Full warranty support

✅ Hassle-free returns

✅ Replacement wet ends, impellers, seals, and AMP cords available

✅ Dedicated customer service team

✨ Summary

The LX Lingxiao 56WUA350-II is a 3.5 HP dual-speed, 230V/60Hz jet pump with a 56-frame thru-bolt motor drawing 11.0 Amps on high speed and 3.5 Amps on low speed. Featuring 2″ MBT center suction and 2″ MBT side discharge with a rotatable wet end, this pump includes 2× unions with O-rings but ships without a cord. Built with a pure copper winding motor, mechanical seal, Class F insulation with thermal protection, IPX5 enclosure, and anti-creep bearings for quiet operation. High speed delivers powerful jet massage while low speed provides quiet filtration and circulation — eliminating the need for a separate circulation pump. Can also be wired as single-speed. Part of the proven LX WUA series — the most popular aftermarket spa pump platform in North America. ETL/CETL certified with a 1-year manufacturer warranty. Available now at Parts4Tubs with fast US shipping and expert compatibility support.

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	Magic Plastics Union 0602-15 (1.5″ Pump Union) | 1-1/2″S x 1-1/2″FBT Union, Pump, Magic, 1-1/2"S x 1-1/2"FBT (Industry Standard) w/ O-Ring	$6.36 Max: 575 Min: 1 Step: 1 Add to cart
	Magic Plastics Union 0602-20 (2″ Pump Union) | 2″S x 2″FBT w/ O-Ring Union, Pump, Magic, 2"S x 2"FBT (Industry Standard) w/ O-Ring	$8.00 Max: 501 Min: 1 Step: 1 Add to cart
	Waterway Union 400-6010 | 2-1/2″ Union Nut with 2-1/2″ Slip tailpiece and o-ring (2.5″ union) Union, Pump, Waterway, 2-1/2"FBT x 2-1/2"S	$14.77 Max: 145 Min: 1 Step: 1 Add to cart
	1 Speed Pump / Blower / AMP Cord | 21086 Amp Plug, Pump, 1-Speed, 14/3, 4-Pin, 5' Cord, White	$24.71 Max: 377 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.