🔄 Laing E10 Universal Spa Circulation Pump — 1/40 HP 115V 3/4″ Barb | 73989

Energy-efficient ECM technology with sealless design and dry run protection for whisper-quiet 24/7 circulation

♨️ Product Overview

The Laing E10 (73989) is a 115V, single-speed, 3/4″ barb universal circulation pump used across dozens of hot tub brands and designed to replace virtually all older Laing SM-909 and SM-1212 series pumps. Powered by a high-efficiency Electronically Commutated (EC) permanent magnet spherical motor, this pump draws only 62 watts at 3,100 RPM while delivering up to 15 GPM — consuming 40% less energy than previous SM-909 and SM-1212 induction motor models. The patented sealless, shaftless design means there is no mechanical seal — eliminating the most common leak path in circulation pumps. The magnetically driven open impeller features a high-density ceramic ball bearing and graphite impeller bearing cap for exceptionally smooth, ultra-quiet operation. Built-in dry run protection automatically shuts the pump down if it detects no water and retries in 30 seconds, protecting the motor from damage. Automatic overload protection and a soft start (approximately 3 seconds) further safeguard the motor and electrical system. Operating at less than 40 dB, this compact pump weighs less than 5 lbs and fits in even the tightest equipment bays. The integrated thermoplastic pump bracket can be mounted at 4 different discharge angles for flexible installation in any plumbing configuration. The pump includes a 4-foot power cord with terminated ends and a mounting bracket, and installs horizontally or vertically (motor end down). Found as OEM equipment in Dimension One, Gatsby Spas, Hot Springs, Jacuzzi, Sundance, and many other brands, the 73989 is the industry-standard universal 115V 3/4″ barb circulation pump.

💡 73989 vs. 6500-460: Both are the same Laing E10 pump (model E10-NSHNDNN1W-02 / OEM 6050U0015). The 73989 is the generic Laing part number for universal applications. The 6500-460 is the Sundance/Jacuzzi OEM designation for the same pump. Either part number works — they are interchangeable.

⭐ Key Features

✅ ECM Permanent Magnet Motor — Electronically commutated spherical motor draws only 62 watts at 3,100 RPM — 40% less energy than SM-909/SM-1212

✅ Sealless, Shaftless, Leak-Proof — Patented magnetically driven design — no mechanical seal to leak or replace

✅ Dry Run Protection — Embedded microprocessor shuts pump down if no water detected, retries automatically in 30 seconds

✅ Automatic Overload Protection — Built-in motor protection against electrical overload

✅ Whisper-Quiet — Less than 40 dB — virtually silent 24/7 operation

✅ 15 GPM Maximum Flow — Higher flow capacity than many comparable circulation pumps

✅ Clog-Resistant Open Impeller — Dynamically balanced with ceramic ball bearing and graphite bearing cap

✅ Rotatable Bracket — 4 Positions — Integrated thermoplastic bracket mounts at 4 different discharge angles

✅ Compact & Lightweight — Less than 5 lbs — fits in the tightest equipment bays

✅ 4′ Power Cord & Mounting Bracket Included — Ready to install out of the box

✅ Universal Replacement — Direct replacement for SM-909, SM-1212, and OEM pumps across dozens of spa brands

✅ 1-Year Manufacturer’s Warranty — Full warranty coverage

⚙️ Technical Specifications

Specification	Value
Manufacturer	Laing / Xylem / Goulds
Series	E10 (Ecocirc)
Part Number	73989
Laing Model	E10-NSHNDNN1W-02 (also E10-NSHN1W-19, E10-NSHNNN1W-19)
Laing OEM Number	6050U0015
Pump Type	Circulation Pump — Single Speed
Motor Type	ECM — Electronically Commutated AC/DC/AC Spherical Motor (Canned Spherical Type) — Permanent Magnet
Horsepower	1/40 HP
Input Power	62 watts (115V / 60Hz)
Voltage	115V
Frequency	50/60 Hz
Amperage	0.95A
RPM	3,100
Flow Rate (Max)	15 GPM
Connection Size	3/4″ Barb (intake and discharge)
Rotation	Counter-clockwise (viewed from motor end)
Impeller Type	Open — magnetically driven — clog resistant — dynamically balanced
Bearing	High-density ceramic ball bearing
Impeller Bearing Cap	Graphite
Seal	None — patented sealless, shaftless design (no mechanical seal)
Wet End	Thermoplastic
Maximum Temperature	140°F (60°C)
Mounting	Horizontal or vertical (motor end down) — bracket mounts at 4 discharge angles
Weight	Less than 5 lbs
Noise Level	Less than 40 dB
Cord	✅ 4′ (48″) power cord INCLUDED — terminated ends
Mounting Bracket	✅ INCLUDED — integrated thermoplastic bracket
Dry Run Protection	✅ Embedded microprocessor — shuts down and retries in 30 seconds
Overload Protection	✅ Automatic motor overload protection
Soft Start	✅ Approximately 3 seconds
Heat Transfer	90% of motor heat transferred into water (not lost to air)
Duty Cycle	Continuous — designed for 24/7 operation
Warranty	1-year manufacturer’s warranty

⚡ Electrical Requirements

Electrical Spec	Requirement
Supply Voltage	115V
Frequency	60 Hz
Phase	Single Phase
Amperage	0.95A
Input Wattage	62W
RPM	3,100
Cord	4′ (48″) — terminated ends — INCLUDED
Motor Type	ECM AC/DC/AC Spherical — Permanent Magnet
Overload Protection	Automatic — built-in

⚠️ IMPORTANT: This is a 115V pump ONLY. For 230V spa systems, use the 230V version of the E10 (see Laing E10 family table below). Always verify the voltage on your existing pump label before ordering. Using the wrong voltage will damage the motor.

⚠️ 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.

🔗 Compatibility Guide

Compatible Spa Brands — Confirmed

Brand	Compatibility	Notes
Dimension One (D1)	✅ Confirmed	115V models with 3/4″ barb circ pump
Gatsby Spas	✅ Confirmed	115V models with 3/4″ barb circ pump
Hot Springs	✅ Confirmed	115V models with 3/4″ barb circ pump
Jacuzzi	✅ Confirmed	115V models — replaces 6500-038, 6500-460
Sundance	✅ Confirmed	115V models — replaces 6500-460
Tiger River	✅ Confirmed (customer reviews)	115V models (Caspian and others)
Caldera	✅ Compatible	115V models with 3/4″ barb circ pump
Cal Spa	✅ Compatible	115V models with 3/4″ barb circ pump
Any spa with 115V 3/4″ barb circ pump	✅ Universal fit	Same voltage and connection type

This Pump Replaces — SM-909 / SM-1212 Series

The Laing E10 is the current-production field replacement for all discontinued SM-909 and SM-1212 series circulation pumps. If your existing pump has an SM-909 or SM-1212 part number, this E10 is the correct replacement.

Original Model	Original Cord Length	This E10 Replaces It
SM-909-NHW-14 (6848)	14″ cord	✅ Yes
SM-909-NHW-18 (6865)	18″ cord	✅ Yes
SM-909-NHW-26 (6860)	26″ cord	✅ Yes
SM-1212-NHW-26 (6958)	26″ cord	✅ Yes

💡 Cord Length Note: The E10 comes with a 4-foot (48″) cord — significantly longer than all SM-909 cords (14″-26″). The longer cord provides more installation flexibility.

Plumbing Compatibility

Your Existing Connection	This Pump	Notes
3/4″ barb	✅ Direct fit	3/4″ barbed intake and discharge — connects to 3/4″ ID vinyl tubing
1″ barb	❌ Wrong size	Use Laing E10 74069 (115V, 1″ barb) instead
3/4″ MPT (threaded)	❌ Wrong type	Use Laing E10 74009 (115V, 3/4″ MPT) instead
1-1/2″ MBT threaded	❌ Not compatible	Barb connections only — not for MBT plumbing

Laing E10 Family — Connection Variants

Part Number	Voltage	Connection	Notes
73989	115V	3/4″ Barb	✅ THIS PUMP
74069	115V	1″ Barb	Same pump, larger barb — for 1″ tubing
74009	115V	3/4″ MPT (threaded)	Same pump, threaded connections
6500-460	115V	3/4″ Barb	Same as 73989 — Sundance/Jacuzzi OEM designation
LHB07100138	230V	3/4″ Barb	230V version — for 230V spa systems
74079	230V	1″ Barb	230V version, 1″ barb connections
73999	230V	3/4″ MPT (threaded)	230V version, threaded connections

⚠️ Replacement Note (from SpaParts.com): If replacing a 73989 (3/4″ barb) with a 74069 (1″ barb), you must purchase barb adapters (42-0013 × 2 qty) and coupling (64-0006) for proper plumbing fit.

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📐 Alternate Part Numbers

Primary Part Numbers

Part Number	Notes
73989	Laing primary part number (THIS PUMP)
6050U0015	Laing OEM manufacturer number
E10-NSHNDNN1W-02	Laing model number
E10-NSHN1W-19	Laing newer model revision
E10-NSHNNN1W	Laing variant designation
E10-NSHNNN1W-19	Laing variant designation

Sundance / Jacuzzi OEM Cross-References (Same Pump)

Part Number	Notes
6500-460 / 6500-460NA	Sundance / Jacuzzi OEM — same physical pump as 73989
6500-038	Jacuzzi J-300 series 115V circ pump
SD6500-460 / SD6500460	Alternate format for 6500-460
SD6540-460	Alternate format variant
SUN6500-460	Sundance branded variant

HydroQuip Cross-References

Part Number	Notes
10-0120 / 10-0120M-K	HydroQuip catalog number
HQ100120MK / HQ100120M	HydroQuip format
SD6500-4610-0120M-K	Combined reference number

Older Laing SM-909 / SM-1212 Models This Pump Replaces

Part Number	Description
SM-909-NHW-14 / SM909NHW-14 / SM-909-NH-14 / 909-NH-14	14″ cord, 3/4″ barb — replaced by this E10
SM-909-NHW-18 / SM909NHW-18 / SM-909-NH-18 / 909-NH-18	18″ cord, 3/4″ barb — replaced by this E10
SM-909-NHW-26 / SM909NHW-26 / SM-909-NH-26 / 909-NH-26	26″ cord, 3/4″ barb — replaced by this E10
SM-1212-NHW-26 / SM1212NHW-26 / 1212-NH-26	26″ cord, 3/4″ barb — replaced by this E10
SM-909-NH-14-2	Variant — replaced by this E10
SM909NH / SM-909 / SM-303	Generic SM-909 references

Laing Numeric Cross-References

Part Number	Notes
73979 / 73349 / 73369	Laing catalog references
73491 / 73588	Laing / Watkins references
6848	Corresponds to SM-909-NH-14
6860	Corresponds to SM-909-NH-26
6865	Corresponds to SM-909-NH-18
6958	Corresponds to SM-1212-NH-26
6846 / 6650 / 6487 / 6496	Older Laing references
6080U0007 / 6080U0027	Laing model variants
611064 / 611123	Laing references
9332-0 / 9336-0 / 9338-0 / 9338-10 / 9339-15	Laing catalog numbers

Combined Laing/SM Format References

Part Number	Notes
LAISM909NH14/12 / LAISM909NH142	Combined Laing/SM-909 references
LAISM909NH1834 / LAISM909NH26120	Combined Laing/SM-909 references
LAISM1212NH2612	Combined Laing/SM-1212 reference

Industry / Distributor Cross-References

Part Number	Notes
34-158-1450	Industry cross-reference
1-00-0136A / 1-00-0136	Industry cross-reference
1-00-0164 / 1-00-0173 / 1-00-0177	Industry cross-reference variants
LAI-10-116	Distributor reference
LHB07100139 / LHB07100169	Catalog references
A-05-280-502	Alternate reference
EL-64104-1 / 5EL-64104-1	Alternate references
3WY87	Dayton cross-reference
733886665000 / 733886684605 / 733886686005	UPC / barcode references
733886686500 / 733886695809 / 733886739893	UPC / barcode references

Watkins / Hot Springs / Caldera Cross-References

Part Number	Notes
Watkins 37949 / 34378 / 73491	Watkins brand references
Watkins 301392 / 1039801	Watkins brand references
SilentFlo 5000	Watkins branded pump name

LTI Cross-References

Part Number	Notes
LTI 7060 / LTI 70813 / LTI 73588	LTI brand references
LTI 73989 / LTI 73369 / LTI 37949	LTI brand references

Grundfos Replacement Alternative

Part Number	Notes
10-0139-KIT	Grundfos 3-speed universal kit (115V) — can replace this Laing E10
10-0139-K	Grundfos pump with adapters (115V)
99575701P1	Grundfos newer universal kit (115V)

LX Lower-Cost Alternative

Part Number	Notes
WE10-120V	LX brand — same performance and function — lower cost alternative

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🛠️ Installation Requirements

What’s in the Box

Item	Notes
Laing E10 circulation pump	Complete pump assembly with integrated bracket
4′ (48″) power cord	Terminated ends
Mounting bracket	Integrated thermoplastic — mounts at 4 discharge angles

Mounting

Requirement	Specification
Mounting Position	Horizontal OR vertical (motor end down ONLY)
Mounting Method	Integrated bracket — 4 rotatable discharge positions
Do NOT Mount	Motor end UP — only horizontal or motor end down
Access	Allow clearance for cord connections and maintenance

Plumbing

Connection	Size	Notes
Intake	3/4″ barb	Connects to 3/4″ ID vinyl tubing
Discharge	3/4″ barb	Connects to 3/4″ ID vinyl tubing
Tubing	3/4″ ID clear vinyl tubing	Secure with hose clamps (not included)

Installation Notes

⚠️ Verify Voltage: Confirm your existing pump operates on 115V — check the label on your old pump. For 230V systems, use the 230V version of the E10.

⚠️ Bracket Orientation: The integrated bracket mounts at 4 different discharge angles. Rotate to align with your existing plumbing before securing.

⚠️ First Startup: The pump features a soft start (approximately 3 seconds). The impeller may rotate slowly at first until water penetrates the bearings — this is normal Laing behavior. Allow the pump to prime.

⚠️ Dry Run Protection: If the pump detects no water, it will shut down automatically and retry in 30 seconds. If the pump cycles on and off repeatedly, check for air locks or plumbing obstructions.

⚠️ Mounting Orientation: Horizontal or vertical with motor end DOWN only. Never mount with motor end up.

⚠️ SM-909 Replacement: The E10’s 4′ (48″) cord is longer than all SM-909 cords (14″-26″). Route excess cord safely away from heat sources and moving parts.

⚠️ Maximum Water Temperature: 140°F (60°C). Do not use in applications exceeding this temperature.

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

⚠️ Bonding & Grounding Required: Per NEC requirements.

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🔧 Maintenance Guide

Routine Maintenance

Task	Frequency	Notes
Check for water flow	Monthly	Verify circulation is active
Inspect barb connections	Monthly	Check for leaks at hose clamp connections
Listen for unusual noise	Monthly	Should be nearly silent (less than 40 dB)
Inspect cord and connections	Quarterly	Check terminated ends and cord condition
Check mounting bracket	Quarterly	Ensure pump is secure at all 4 clip points
Verify GFCI operation	Monthly	Press test button to check

Warning Signs — Replace Pump If:

• Pump fails to start or hums without rotation
• Unusual noise (clicking, grinding, buzzing)
• No water circulation despite pump running
• Motor trips breaker or GFCI repeatedly
• Pump vibrating excessively
• Dry run protection cycling repeatedly (pump starts, stops, retries every 30 seconds) — indicates plumbing issue, but if plumbing is clear, pump may need replacement
• Error codes on spa controller related to circulation (FL1, FLO, etc.)

Sealless Design Advantage

Unlike traditional circulation pumps with mechanical shaft seals, the Laing E10 uses a patented magnetically driven impeller — there is no mechanical seal to leak, wear, or replace. This eliminates the single most common failure point in spa circulation pumps. If you see water leaking from this pump, it indicates a cracked wet end housing or a failed barb connection — not a seal issue.

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🎯 Ideal Applications

Application	Suitability	Notes
♨️ Universal 115V spa circulation	✅ Yes — Primary use	Any spa with 115V 3/4″ barb circ pump
♨️ SM-909 / SM-1212 replacement	✅ Yes — Direct upgrade	All SM-909-NHW and SM-1212-NHW models
♨️ Dimension One circ pump	✅ Yes — Confirmed	115V models with 3/4″ barb
♨️ Gatsby Spas circ pump	✅ Yes — Confirmed	115V models with 3/4″ barb
♨️ Hot Springs circ pump	✅ Yes — Confirmed	115V models with 3/4″ barb
♨️ Jacuzzi 115V circ pump	✅ Yes — Confirmed	Same as 6500-460 / 6500-038
♨️ Sundance 115V circ pump	✅ Yes — Confirmed	Same as 6500-460
♨️ Tiger River circ pump	✅ Yes — Customer confirmed	Caspian and other 115V models
♨️ Low-flow heater circulation	✅ Yes — Designed for	Maintains flow through heater assembly
♨️ Ozone system circulation	✅ Yes — Excellent	Low-flow ideal for ozone injection
♨️ 230V spa systems	❌ No — Wrong voltage	Use 230V E10 (LHB07100138, 74079, or 73999)
♨️ Spas with 1″ barb connections	❌ No — Wrong size	Use Laing E10 74069 (115V, 1″ barb)
♨️ Spas with 3/4″ MPT threaded	❌ No — Wrong type	Use Laing E10 74009 (115V, 3/4″ MPT)
♨️ Spas with 1-1/2″ MBT threaded	❌ No — Wrong type	Barb connections only

❓ Frequently Asked Questions

Q: What is the difference between 73989 and 6500-460? A: They are the same physical pump — both are the Laing E10 model E10-NSHNDNN1W-02 (OEM 6050U0015) with 3/4″ barb connections at 115V. The 73989 is the generic Laing part number for universal applications. The 6500-460 is the Sundance/Jacuzzi OEM designation for the same pump. Either works — they are fully interchangeable.

Q: What spas use this pump? A: The 73989 is used across many brands including Dimension One, Gatsby Spas, Hot Springs, Jacuzzi, Sundance, Tiger River, Caldera, and Cal Spa. It fits any spa using a 115V circulation pump with 3/4″ barb connections.

Q: Will this replace my old SM-909 pump? A: Yes — the Laing E10 is the current-production replacement for all discontinued SM-909-NHW and SM-1212-NHW series circulation pumps with 3/4″ barb connections. No plumbing modification is necessary. The E10’s 4′ cord is longer than the original SM-909 cords.

Q: Does this pump have a shaft seal that can leak? A: No — this is a key advantage. The Laing E10 uses a patented sealless, shaftless design with a magnetically driven impeller. There is no mechanical seal to leak, wear, or replace.

Q: What does the dry run protection do? A: If the pump detects it is running without water, it automatically shuts down and retries in 30 seconds. This protects the motor from damage if the pump loses prime or if there is an air lock in the plumbing.

Q: Is a cord included? A: Yes — a 4-foot (48″) power cord is included with terminated ends. A mounting bracket is also included.

Q: Can I mount this pump in different positions? A: Yes — the pump installs horizontally or vertically (motor end down only). The integrated bracket can be mounted at 4 different discharge angles to align with your plumbing.

Q: How quiet is this pump? A: Very quiet — rated at less than 40 dB. Customer reviews consistently describe it as whisper-quiet and nearly silent during 24/7 operation.

Q: What is the maximum flow rate? A: Up to 15 GPM depending on plumbing conditions and system back-pressure. This is sufficient for low-flow heater circulation, filtration, and ozone injection in most spas.

Q: What is the maximum water temperature? A: 140°F (60°C). Do not use in applications exceeding this temperature.

Q: My spa uses 1″ barb connections — will this pump fit? A: No — this pump has 3/4″ barb connections. For 1″ barb plumbing, use the Laing E10 74069 (115V, 1″ barb) instead.

Q: My existing pump is 230V — can I use this? A: No — this is a 115V pump only. For 230V spa systems, use the 230V version of the Laing E10 (such as LHB07100138, 74079, or 73999 depending on your connection type).

Q: Is there a Grundfos alternative? A: Yes — the Grundfos 10-0139-KIT (115V, 3-speed, universal kit) is designed as a universal replacement for this Laing E10 and includes a complete plumbing kit with 3/4″ and 1″ barb adapters. Available separately at Parts4Tubs.

Q: Is there a lower-cost alternative? A: Yes — the LX WE10-120V offers the same performance and function at a lower price point. SpaCare confirms it as a direct alternative.

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 warranty. Contact Parts4Tubs for full terms.

🏆 Why Choose the Laing E10 73989

✅ Universal Fit — Works across dozens of spa brands — the industry-standard 115V 3/4″ barb circulation pump

✅ ECM Permanent Magnet Motor — 62 watts at 3,100 RPM — 40% more efficient than SM-909/SM-1212 models

✅ Patented Sealless, Leak-Proof Design — No mechanical seal — eliminates the most common circulation pump failure point

✅ 15 GPM Maximum Flow — Higher capacity than many comparable circ pumps

✅ Built-In Dry Run Protection — Auto-shutdown and 30-second retry protects motor from damage

✅ Automatic Overload Protection — Built-in motor protection

✅ Whisper-Quiet — Less than 40 dB — virtually silent 24/7 operation

✅ 90% Heat Transfer Efficiency — Motor heat transferred into water, not wasted to air

✅ Rotatable 4-Position Bracket — Installs at any discharge angle — adapts to any plumbing layout

✅ Compact & Lightweight — Less than 5 lbs — fits in tight equipment bays

✅ 4′ Cord & Mounting Bracket Included — Ready to install out of the box

✅ Direct SM-909 Upgrade — Drop-in replacement — no plumbing modification needed

✅ Proven Reliability — Laing (Xylem) — world-renowned circulation pump manufacturer

✅ 1-Year Manufacturer’s Warranty — Full warranty coverage

🤝 Why Buy From Parts4Tubs

✅ Fast shipping across the United States

✅ Expert advice from spa and hot tub specialists

✅ Competitive pricing

✅ Full warranty support

✅ Hassle-free returns

✅ Related plumbing parts, vinyl tubing, barb fittings, and hose clamps available

✅ Dedicated customer service team

✨ Summary

The Laing E10 (73989) is a 115V, 1/40 HP, 0.95A universal circulation pump with 3/4″ barb connections, designed as the industry-standard replacement for virtually all older SM-909 and SM-1212 series pumps and OEM circulation pumps across dozens of spa brands including Dimension One, Gatsby, Hot Springs, Jacuzzi, Sundance, Tiger River, Caldera, and Cal Spa. Features a high-efficiency ECM permanent magnet spherical motor drawing only 62 watts at 3,100 RPM (40% less energy than predecessors), delivering up to 15 GPM. Patented sealless, shaftless, leak-proof design with magnetically driven open impeller, high-density ceramic ball bearing, graphite bearing cap, built-in dry run protection (auto-shutdown with 30-second retry), automatic overload protection, and soft start. Operating at less than 40 dB, weighing less than 5 lbs, with a rotatable 4-position bracket for flexible installation. Includes 4′ power cord and mounting bracket. Same pump as Sundance/Jacuzzi 6500-460 — just the generic Laing part number. 1-year manufacturer’s 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: 554 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: 486 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
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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.