🔌 Waterway Executive 3721221-1D Spa Pump — 3.0 HP Dual Speed 230V 56-Frame | Genuine American-Made Jet Pump

Robust 56-frame motor with dual double-shielded bearings for cooler, quieter, longer-lasting spa performance

💧 Product Overview

The Waterway Executive 3721221-1D is a 3.0 HP dual-speed jet pump built around a heavy-duty 56-frame motor — designed, engineered, and manufactured in the USA by Waterway Plastics in Oxnard, California since 1973. Operating at 230V/60Hz with 10.0 Amps on high speed (3,450 RPM) and 3.4 Amps on low speed (1,725 RPM), this pump delivers powerful jet performance through a large 6-1/2″ diameter Executive wet end specifically designed for 56-frame motors to produce higher head pressure with improved flow. The 56-frame motor is physically larger than a 48-frame, providing added strength, cooler operating temperatures, and longer motor life. It features dual double-shielded ball bearings with moisture-resistant grease for quieter operation, four sets of insulated windings on the dual-speed motor for increased efficiency, and a split capacitor (start and run) for reduced energy consumption. The pump has 2″ center suction and 2″ side discharge with Male Buttress Thread (MBT) connections, and the wet end is rotatable every 90 degrees for versatile plumbing configurations. Seal construction uses silicon carbide, Viton bellows, and 316 stainless steel casing for corrosion resistance against chlorine, bromine, and salt water. This pump replaces OEM equipment in Dynasty Spas, Coast Spas, and is used in Clarity, Legacy Whirlpool, Michael Phelps Swim Spas, and Twilight Series spas. Also known as model PF-30-2N22C (now updated to PF-20-2N22M) and new Waterway part number ME-30226-20. UL certified. Made in the USA. Backed by Waterway’s manufacturer warranty.

✨ Key Features

✅ 3.0 HP Dual Speed — 10.0/3.4 Amps — High speed at 3,450 RPM powers demanding jets; low speed at 1,725 RPM provides efficient 24/7 filtration and circulation at minimal operating cost

✅ 56-Frame Motor — Physically larger than 48-frame motors, providing added strength, cooler operating temperatures, and significantly longer motor life

✅ Dual Double-Shielded Ball Bearings — Moisture-resistant grease for quieter operation and extended bearing life in humid spa environments

✅ Four Sets of Insulated Windings — Dual-speed motor uses four separate insulated windings for increased efficiency and performance

✅ Split Capacitor (Start and Run) — Reduces energy consumption compared to single-capacitor designs

✅ Large 6-1/2″ Executive Wet End — Specifically designed for 56-frame motors, delivering higher head pressure with improved flow and reduced noise

✅ Silicon Carbide Seals / Viton Bellows / 316SS Casing — Premium corrosion-resistant materials engineered for chlorine, bromine, and salt water environments

✅ Rotatable Wet End — Discharge rotatable every 90 degrees (12, 3, 6, or 9 o’clock positions) for flexible installation configurations

✅ Made in USA — Designed, engineered, and manufactured by Waterway Plastics in Oxnard, California

✅ Multi-Brand OEM Replacement — Replaces pumps in Dynasty Spas, Coast Spas, Clarity, Legacy Whirlpool, Michael Phelps Swim Spas, Twilight Series, Aquastorm by Infinity Spas, and more

✅ Automatic Thermal Overload Protection — Built-in motor protection extends service life and prevents damage from overheating

✅ UL Certified — Independently tested and certified for the US market

🔩 Technical Specifications

Specification	Value
Manufacturer	Waterway Plastics (Oxnard, CA, USA)
Product Line	Executive 56-Frame Series
Part Number	3721221-1D
New Part Number	ME-30226-20
Model Number	PF-30-2N22C (updated to PF-20-2N22M)
Horsepower	3.0 HP
Speed Settings	Dual Speed (2-Speed)
High Speed RPM	3,450
Low Speed RPM	1,725
Voltage	230V
Frequency	60 Hz
High Speed Amperage	10.0 Amps
Low Speed Amperage	3.4 Amps
Frame Type	56 Frame (56Y)
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″ (approximately 3.06 inches)
Wet End Diameter	6-1/2 inches
Seal Type	Silicon Carbide / Viton Bellows / 316 Stainless Steel Casing
Wet End Position	Standard 12 o’clock; rotatable every 90°
Dimension “A” (Motor Length)	9.875 inches
Volute Fastening	8 screws
Motor Part Number	7-187694-01 (reference — motor brand may vary)
Cord	NOT included — use existing cord or purchase separately
Certifications	UL
Country of Origin	USA
Warranty	See warranty note below

⚡ Electrical Requirements

Electrical Spec	Requirement
Supply Voltage	230V
Frequency	60 Hz
Phase	Single Phase
High Speed Amps	10.0 A
Low Speed Amps	3.4 A
High Speed RPM	3,450
Low Speed RPM	1,725
Motor Windings	Four sets of insulated windings (dual speed)
Capacitor	Split capacitor (start and run)
Overload Protection	Automatic Thermal Overload Protection
Cord	NOT included — 4-wire 2-speed pump cord required (AMP or JJ connector)

🔗 Compatibility Guide

Frame & Port Configuration

Specification	Detail
Frame	56 Frame (56Y)
Wet End Diameter	6-1/2 inches
Suction	2″ MBT (Center)
Discharge	2″ MBT — Side (rotatable every 90°)
Outside Thread Diameter	3-1/16″ (approximately 3.06 inches)

OEM / Factory-Installed In

Spa Brand	Part Numbers / Notes	Source
Dynasty Spas	155553, 15553 (2018 and newer) — variant 3721221-1O5ADY	HotTubOutpost confirmed
Coast Spas	3721221-0D85 (DISCONTINUED — replaced by 3721221-1D)	HotTubOutpost confirmed
Clarity Spas	3721221-0D6BMR variant	WaterwayParts confirmed
Legacy Whirlpool	3721221-0D6BMR variant	WaterwayParts confirmed
Michael Phelps Swim Spas	3721221-0D6BMR variant	WaterwayParts confirmed
Twilight Series	3721221-0D6BMR variant	WaterwayParts confirmed

Also Replaces

Brand / Pump	Notes	Source
Aquastorm by Infinity Spas	Match fittings and amp rating	SpaGuts confirmed
Massage Master XLT	Match fittings and amp rating	SpaGuts, SpaDepot confirmed
Super-Flo	Match fittings and amp rating	SpaGuts confirmed

Compatibility Verification Checklist

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

1. Frame type — must be 56 frame (do NOT upgrade from 48-frame to 56-frame without verifying your spa can handle the increased power)
2. Voltage — must be 230V / 60Hz
3. Amperage — should be approximately 10.0A (high) / 3.4A (low) — verify your spa pack can support this amperage
4. Port sizes — both suction and discharge are 2″ MBT (3-1/16″ outside thread diameter)
5. Discharge direction — side discharge
6. Speed — dual speed (can also be wired as single speed)

⚠️ 48-Frame vs 56-Frame Warning (from SpaGuts): Keep in mind not to overpower your spa by going from a 48-frame motor to a 56-frame motor. If your existing pump is a 48-frame, verify that your spa equipment bay can physically accommodate the larger 56-frame pump and that your spa pack can handle the electrical load.

⚠️ Need 2-1/2″ Suction Port? The 3721221-13 variant has 2-1/2″ intake × 2″ discharge for spas with larger suction plumbing (3-7/16″ across pump threads on suction side). New part number: ME-30226-25.

📐 Alternate Part Numbers

Primary Designations

Part Number	Notes	Source
3721221-1D	Primary Waterway Executive 56 Part Number	All sources confirmed
ME-30226-20	New replacement Waterway part number (replaces 3721221-1D)	Pool&HotTubDepot, HotTubOutpost, SpaDepot confirmed
PF-30-2N22C	Original Waterway model designation (Century motor)	SpaGuts, SpaCare, SpaDepot confirmed
PF-20-2N22M	Updated Waterway model designation (US Motors)	Pool&HotTubDepot confirmed
37212211D	No-hyphen format	SpaCare, INYOPools confirmed
WW37212211D	Waterway prefix format	SpaCare, HotTubOutpost confirmed
3721221	Base model number	SpaCare, HotTubOutpost confirmed
3M21221	Alternate base designation	SpaCare, HotTubOutpost confirmed

Distributor / Retailer Designations

Part Number	Notes	Source
WWP3721221-1D	Distributor designation	SpaCare, HotTubOutpost confirmed
WWP-10-1454	Distributor designation	SpaCare, HotTubOutpost confirmed
HTO-3721221-1D	HotTubOutpost designation	SpaCare confirmed
15-350-0030	Distributor designation	SpaCare confirmed
1-00-0107	Industry / OEM code	SpaCare confirmed

OEM / Cross-Reference Part Numbers

Part Number	Brand / Notes	Source
1-P230E52024	OEM cross-reference	SpaCare, HotTubOutpost confirmed
1404036	OEM cross-reference	SpaCare, HotTubOutpost confirmed
404036	OEM cross-reference (short form)	SpaCare, HotTubOutpost confirmed
301910	OEM cross-reference	SpaCare, HotTubOutpost confirmed
5039-306	OEM cross-reference	SpaCare, HotTubOutpost confirmed
155553	Dynasty Spas	HotTubOutpost confirmed
15553	Dynasty Spas (alternate)	HotTubOutpost confirmed

Spa-Specific / Factory Variant Part Numbers

Part Number	Brand / Notes	Source
3721221-0D6BMR	Clarity, Legacy Whirlpool, Michael Phelps Swim Spas, Twilight Series — replaced by 3721221-1D	WaterwayParts, INYOPools confirmed
3721221-0D85	Coast Spas (DISCONTINUED — replaced by 3721221-1D)	HotTubOutpost confirmed
3721221-0D5A	Factory variant — replaced by 3721221-1D	SpaGuts, SpaDepot confirmed
3721221-0D87	Factory variant — replaced by 3721221-1D	SpaGuts, SpaDepot confirmed
3721221-0385	Factory variant — replaced by 3721221-1D	SpaGuts confirmed
3721221-1O5ADY	Dynasty Spas 2018+ variant (6 BHP rated, same 10.0/3.4A)	HotTubOutpost confirmed
3721221-0O5ADY	Dynasty Spas variant (same as -1O5ADY)	HotTubOutpost confirmed
372122A-1D	Alternate format	SpaGuts confirmed
372122A-0D76VK	Factory variant	SpaGuts confirmed

Motor Part Number (Reference Only)

Part Number	Notes	Source
7-187694-01	Motor used in this pump (brand may vary)	SpaGuts confirmed

Complete Executive 56-Frame Family (Waterway 2015 Catalog PDF Confirmed)

2-Speed Models:

Part Number	HP	Ports	Volts	Amps (Hi/Lo)	Dim “A”
3720821-1D	2 HP	2″ × 2″	230V	8.0/3.0 A	8.875″
3720821-13	2 HP	2-1/2″ × 2″	230V	8.0/3.0 A	8.875″
3721221-1D	3 HP	2″ × 2″	230V	10.0/3.4 A	9.875″
3721221-13	3 HP	2-1/2″ × 2″	230V	10.0/3.4 A	9.875″
3721621-1D	4 HP	2″ × 2″	230V	12.0/4.4 A	10.375″
3721621-13	4 HP	2-1/2″ × 2″	230V	12.0/4.4 A	10.375″
3722021-1D	5 HP	2″ × 2″	230V	16.4/4.8 A	10.375″
3722021-13	5 HP	2-1/2″ × 2″	230V	16.4/4.8 A	10.375″

1-Speed Models:

Part Number	HP	Ports	Volts	Amps	Dim “A”
3710821-1D	2 HP	2″ × 2″	230V	8.0 A	8.875″
3711221-1D	3 HP	2″ × 2″	230V	10.0 A	9.875″
3711621-1D	4 HP	2″ × 2″	230V	12.0 A	10.375″
3712021-1D	5 HP	2″ × 2″	230V	16.4 A	10.375″

Wet End Part Numbers (Reference)

Part Number	Notes	Source
310-1730	56-frame Executive wet end (2″ intake)	HotTubOutpost confirmed
310-1500	56-frame Executive wet end (2-1/2″ intake, for 3721221-13)	SpaPumpsAndMore confirmed

⚠️ 56-Frame Executive (-1D) vs 48-Frame Executive (-1A) Note: The 56-frame Executive 3721221-1D (3.0 HP, 10.0/3.4A) is a different pump from the 48-frame Executive 3421221-1A (3.0 HP, 8.5/2.8A). The 56-frame motor is physically larger and draws more amperage. Always match frame size, amperage, and physical dimensions when selecting a replacement.

💡 LX Alternative: HotTubOutpost notes the LX 56WUA300-II as a cost-saving alternative to the 3721221-1D. Always verify amp ratings and physical dimensions match before substituting.

🛠️ Installation Requirements

Mounting (from Waterway Installation Manual 810-0061)

Requirement	Specification
Mounting Position	Horizontal — on a level surface
Location	Below water level (flooded suction / not self-priming)
Surface	Level surface with adequate floor drainage
Moisture Protection	Installation area should be clear of direct water; protect pump from excessive moisture
Ventilation	Adequate clearance around motor for air cooling
Shut-Off Valves	Install on both inlet and outlet for future maintenance

Plumbing

Connection	Size
Suction	2″ MBT (Center)
Discharge	2″ MBT (Side)
Outside Thread Diameter	3-1/16″ (approximately 3.06 inches)

Installation Notes (from Waterway Installation Manual 810-0061)

⚠️ Not Self-Priming — Water must be above pump head in order to operate properly. Pump must be installed below water level. If you need to install your spa pump near or above the waterline — as is common for in-ground spas — you will need a pump pot.

⚠️ HAND TIGHTEN UNIONS ONLY! Do NOT use a wrench or any adhesives or solvents. The inlet and outlet have Waterway male union threads — use Waterway tailpiece assemblies for best connection.

⚠️ Do NOT use pipe dope. Use only Teflon tape or other sealing compounds approved for use with plastic. Pipe dopes not approved for plastic will cause stress cracking.

⚠️ Pressure test should not exceed 40 PSI. Ensure all air is removed from the system during testing.

⚠️ Ground motor prior to connecting electrical power — do NOT ground to a gas supply line.

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

⚠️ Pump cord is NOT included — use your existing cord or purchase separately (AMP or JJ connector).

💡 Wet End Rotation: Loosen the four long bolts at the back of the motor and turn the pump head, allowing the discharge to point to the 12, 3, 6, or 9 o’clock position.

💡 Volute Fastening: The volute on this 56-frame Executive is fastened with 8 screws.

💡 O-Rings: Deluxe versions of this pump include FREE O-rings. Verify O-ring condition before installation to prevent leaks.

⚙️ Maintenance Guide

Routine Maintenance

Task	Frequency	Notes
Check for leaks	Monthly	Inspect around seal area and union connections
Inspect unions	Monthly	Hand tighten only if needed — do NOT use wrenches
Clean motor ventilation openings	Quarterly	Keep clear of debris for proper cooling
Check amperage draw	Annually	Should read within 10% of nameplate (10.0A high / 3.4A low)
Inspect capacitor(s)	Annually	Check for signs of swelling, leaking, or corrosion
Verify GFCI operation	Monthly	Press test button to verify GFCI interrupts power
Check mounting bolts / screws	Quarterly	Tighten if loose

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
• Low speed no longer functions
• Capacitor failure (motor hums but won’t start)
• Amp draw exceeds 10% of nameplate rating
• Bearings worn (excessive vibration or noise)

Seal Information

Detail	Specification
Seal Type	Silicon Carbide / Viton Bellows / 316 Stainless Steel Casing
Corrosion Resistance	Engineered for chlorine, bromine, and salt water environments
Replacement	Replace at first sign of leakage from the seal area

🎯 Ideal Applications

Application	Suitability	Notes
♨️ Hot tub dual-speed jet pump	✅ Yes	Premium 56-frame Executive pump for demanding spa jet systems
♨️ Dynasty Spas OEM replacement	✅ Yes	Replaces Dynasty 155553, 15553 (HotTubOutpost confirmed)
♨️ Coast Spas OEM replacement	✅ Yes	Replaces Coast Spa 3721221-0D85 (HotTubOutpost confirmed)
♨️ Clarity / Legacy Whirlpool / Michael Phelps / Twilight Series	✅ Yes	Replaces 3721221-0D6BMR variant (WaterwayParts confirmed)
♨️ Aquastorm / Infinity Spas replacement	✅ Yes	Match fittings and amp rating (SpaGuts confirmed)
♨️ Single-speed applications	✅ Yes	Can be wired as single-speed using only the high-speed connection
🛁 Whirlpool bath	⚠️ Check compatibility	Verify frame, port, and electrical specifications match

❓ Frequently Asked Questions

Q: What horsepower is this pump? A: This pump is rated at 3.0 HP continuous duty. High speed draws 10.0 Amps at 3,450 RPM; low speed draws 3.4 Amps at 1,725 RPM. Operates on 230V/60Hz. Note that some spa brands may label this pump with inflated HP ratings (such as 6 BHP) — always match by amperage, not horsepower.

Q: What is the difference between the 56-frame (-1D) and 48-frame (-1A)? A: The 56-frame Executive 3721221-1D (3.0 HP, 10.0/3.4A) has a physically larger motor than the 48-frame Executive 3421221-1A (3.0 HP, 8.5/2.8A). The 56-frame provides added strength, cooler operating temperatures, and longer motor life — but draws more amperage and requires more physical space. Always verify your spa equipment bay can accommodate the 56-frame size and that your spa pack supports the amperage draw.

Q: My pump says 3721221-1D but I can only find ME-30226-20. Are they the same? A: Yes. Waterway has updated the part number. ME-30226-20 is the new replacement part number for 3721221-1D. Similarly, the model designation PF-20-2N22M replaces the older PF-30-2N22C. They are the same pump.

Q: What does the “C” or “M” in the model number mean? A: The last letter references the motor brand. “C” indicates a Century/A.O. Smith motor, while “M” indicates a US Motors brand motor. The motor brand does not need to be matched — functionality is the same regardless of motor brand.

Q: Will this replace my Dynasty Spa pump? A: Yes. This pump (or the variant 3721221-1O5ADY) replaces Dynasty Spa pump part numbers 155553 and 15553 (2018 and newer). Always verify amperage and port size match.

Q: Will this replace my Coast Spa pump? A: Yes. The Coast Spa variant 3721221-0D85 has been discontinued and is replaced by the standard 3721221-1D.

Q: Is this pump made in the USA? A: Yes. Waterway Plastics designs, engineers, and manufactures this pump in Oxnard, California, USA.

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″ (approximately 3.06 inches). If your spa has 2-1/2″ suction plumbing, see the 3721221-13 variant (new part number ME-30226-25).

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

Q: Does this pump include a cord? A: No. The pump cord is NOT included. Most of the time, the existing pump cord can be reused if it is in good condition. If a new cord is needed, pump cords are sold separately in AMP or JJ connector types.

Q: Can I rotate the wet end? A: Yes. The discharge can be rotated every 90 degrees by loosening the four long bolts at the back of the motor.

Q: Is this pump self-priming? A: No. This pump is NOT self-priming. Water must be above the pump head for proper operation. If you need to install the pump near or above the waterline (common for in-ground spas), you will need a pump pot.

Q: What warranty is included? A: Waterway’s 2015 Catalog states “Three year warranty on motor and wet end” for 56-frame Executive pumps. Waterway’s general warranty policy states one year from date of purchase if installed by a qualified installer. Contact Parts4Tubs for confirmed warranty terms applicable to your purchase.

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, low speed failure, the motor humming but not starting, or excessive vibration from worn bearings.

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

Q: Can I use the LX 56WUA300-II as an alternative? A: The LX 56WUA300-II is sometimes offered as a cost-saving alternative. However, always verify that the amp ratings, port sizes, and physical dimensions match before substituting any pump.

📥 Downloads & Resources

📄 Waterway 48/56 Frame Executive, EX2, & Viper Pump Installation Manual (810-0061) — Installation instructions, wiring guide, troubleshooting chart, and exploded parts diagram (Waterway Plastics official)

📄 Waterway Spa Pumps Catalog (2015) — Executive 56-Frame Specifications — Complete Executive 56-frame specifications table, performance charts, dimensional drawings, and part number matrix (Waterway Plastics official — Pages 197-198)

🏆 Why Choose the Waterway Executive 3721221-1D

✅ Made in USA — Designed, engineered, and manufactured by Waterway Plastics in California since 1973

✅ 56-Frame Motor Advantage — Larger motor runs cooler, stronger, and lasts longer than 48-frame equivalents

✅ Dual Double-Shielded Bearings — Moisture-resistant grease for quieter, longer-lasting operation in humid environments

✅ Premium Seal Materials — Silicon carbide, Viton bellows, and 316SS casing resist chlorine, bromine, and salt

✅ Energy-Efficient Design — Split capacitor and four insulated windings minimize energy consumption

✅ Genuine Waterway Quality — Not rebuilt, refurbished, or mix-and-match — complete original pump and motor assembly

✅ Multi-Brand Compatibility — Direct replacement for Dynasty, Coast, Clarity, Legacy, Michael Phelps, Twilight, and more

✅ UL Certified — Independently tested and certified for the US market

🤝 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 seals, wet ends (310-1730), motors, and accessories available

✅ Dedicated customer service team

⭐ Summary

The Waterway Executive 3721221-1D is a 3.0 HP dual-speed, 230V/60Hz jet pump built around a heavy-duty 56-frame motor drawing 10.0/3.4 Amps at 3,450/1,725 RPM. Made in the USA by Waterway Plastics, this genuine pump features 2″ MBT center suction and 2″ MBT side discharge, a large 6-1/2″ Executive wet end, dual double-shielded ball bearings with moisture-resistant grease, silicon carbide seals with Viton bellows and 316SS casing, split capacitor design, and automatic thermal overload protection. OEM replacement for Dynasty Spas, Coast Spas, Clarity, Legacy Whirlpool, Michael Phelps Swim Spas, and Twilight Series. Now also ships as new model ME-30226-20. UL certified. Backed by Waterway’s manufacturer 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: 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
	Balboa Amp Plug 21087 (For 2 Speed Pumps) Amp Plug, Pump 1 (2-Speed) 14/4, 72" Long, White	$31.72 Max: 182 Min: 1 Step: 1 Add to cart

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.