🔧 Waterway EX2 Spa Pump 3420610-1U — 1.5 HP 2-Speed 115V 48 Frame

Engineered in the USA for maximum jet performance and energy-efficient spa operation

📋 Product Overview

The Waterway EX2 (Part No. 3420610-1U) is a high-performance 1.5 HP, 2-speed jet pump designed, engineered, and manufactured in the USA by Waterway Plastics of Oxnard, California — an industry leader since 1973. This 48-frame, 115V/60Hz spa pump delivers powerful hydrotherapy at 3,450 RPM on high speed and energy-saving filtration at 1,725 RPM on low speed, making it ideal for larger spa installations with multiple jets.

The EX2 wet end fits within the same volume envelope as the Aqua-Flo XP2 and XP2e, allowing it to serve as a direct substitute or retrofit replacement without plumbing modifications. With 2″ intake and 2″ side discharge (male union thread connections), UL and CUL certifications, and high-efficiency motors custom-designed for spa applications, the EX2 delivers unsurpassed performance from a pump you can trust. This pump is also a verified replacement for Wavemaster 5000 (36745), Wavemaster 6000 (39583), and numerous Aqua-Flo, Watkins/Caldera, Coleman, and Bullfrog spa pump models. Cord and unions are sold separately.

✨ Key Features

• ✅ 1.5 HP True Continuous Rated — Full-rated horsepower, not inflated peak or brake HP
• ✅ 2-Speed Operation — High speed (3,450 RPM) for massage jets; low speed (1,725 RPM) for energy-efficient filtration
• ✅ 115V / 60Hz — Standard US household voltage operation
• ✅ Made in the USA — Designed, engineered, and manufactured by Waterway Plastics in Oxnard, California
• ✅ 48-Frame Compact Design — Fits standard 48Y frame mounting positions in most spa equipment bays
• ✅ Same Envelope as Aqua-Flo XP2/XP2e — Direct retrofit replacement without replumbing
• ✅ 2″ Intake and 2″ Side Discharge — Male union thread connections (thread OD approximately 3-1/16″)
• ✅ UL and CUL Certified — UL File No. E128519 for safety compliance in the US and Canada
• ✅ High-Efficiency Motors — Custom designed for spa applications with thermal overload protection
• ✅ Can Be Wired Single or Dual Speed — Versatile wiring options for different spa control systems
• ✅ 1-Year Manufacturer Warranty — Waterway Plastics factory warranty when installed by a qualified installer

⚙️ Technical Specifications

Specification	Value
Part Number	3420610-1U
Manufacturer	Waterway Plastics (Oxnard, CA, USA)
Pump Series	EX2
Pump Type	Jet Pump — Side Discharge
Motor Power (Full Rated)	1.5 HP Continuous
Speed Settings	2-Speed (High and Low)
High Speed RPM	3,450 RPM
Low Speed RPM	1,725 RPM
Voltage	115V
Frequency	60 Hz
Amperage (High Speed)	16.4A
Amperage (Low Speed)	4.4A
Frame Type	48Y (Thru-Bolt)
Motor Diameter	5.6″
Discharge Port Size	2″ Male Union Thread
Suction Port Size	2″ Male Union Thread
Discharge Location	Side
Suction Location	Center (front face)
Thread Outer Diameter	Approximately 3-1/16″ (3.1″)
Unions Included	No — Sold separately
Cord Included	No — Cord not included
UL File Number	E128519
Certifications	UL, CUL
Country of Manufacture	USA
Warranty	1 Year (Manufacturer)
Weight	Approximately 29.5 lbs

⚠️ Amperage Note: The manufacturer PDF (Waterway document 807-0068.0609) specifies 16.4A high / 4.4A low for the 3420610-1U with an A.O. Smith motor. Waterway reserves the right to substitute motor brands (A.O. Smith, US Motors, Century, GE, etc.) without notice. Amperage ratings may vary slightly depending on the motor brand shipped — always verify the nameplate rating on your specific pump before sizing circuits and breakers. Some retailers list 13.5/4.7A or 13.3/4.1A based on different motor versions. Functionality remains the same regardless of motor brand.

⚠️ Capacitor Note: The pump may ship with one or two capacitors mounted on top of the motor housing depending on the motor model. Ensure adequate clearance around the motor for either configuration.

⚡ Electrical Requirements

Electrical Spec	Requirement
Supply Voltage	115V
Frequency	60 Hz
Phase	Single
Full Load Amps (High Speed)	16.4A (per manufacturer PDF; may vary by motor brand)
Full Load Amps (Low Speed)	4.4A (per manufacturer PDF; may vary by motor brand)
Wiring	Per motor nameplate wiring diagram

⚠️ IMPORTANT:

All electrical work must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local and state building codes.

Hot tubs require GFCI (Ground Fault Circuit Interrupter) protection — the pump must be supplied through a GFCI device with a rated residual operating current not exceeding 30mA per the manufacturer’s installation manual.

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

Ground the motor prior to connecting electrical power. Do not ground to a gas supply line. Improper grounding can cause serious injury and damage to the motor, voiding the warranty.

Applied voltage must correspond to the rated voltage indicated on the motor marking plate. Voltage at terminals should be within 10% of nameplate rating.

For 2-speed models: Do not wire both speeds to run simultaneously.

Single-Speed Wiring Option: This 2-speed pump can also be wired for single-speed operation when connected to a single-speed spa control system.

🔗 Compatibility Guide

This Pump:

• 📐 Frame: 48Y (Thru-Bolt)
• 📐 Intake: 2″ Male Union Thread — Center (front face)
• 📐 Discharge: 2″ Male Union Thread — Side
• 📐 Thread OD: ~3-1/16″ (3.1″)
• 📐 Volume Envelope: Same as Aqua-Flo XP2 / XP2e

Direct Replacement / Retrofit For:

Pump Series	Notes
Aqua-Flo XP2	Same physical size — direct substitute
Aqua-Flo XP2e	Same physical size — direct substitute
Aqua-Flo FMXP / FMXP2	Verify model-specific configuration
Wavemaster 5000 (36745)	Verified replacement
Wavemaster 6000 (39583)	Verified replacement — also Watkins 39583

Cross-Reference Part Numbers (Verified Replacements):

Part Number	Application
06115000-1	Aqua-Flo
05615008-2	Aqua-Flo
05615316-2	Aqua-Flo
06115484-2	Aqua-Flo
06115319-2	Aqua-Flo
06615686-2	Aqua-Flo
06615607-1	Aqua-Flo
06615763-1	Aqua-Flo
06615890-1	Aqua-Flo
06115511-2	Coleman Spa
06118437-2	Bullfrog Spa
06118371-2	Bullfrog Spa
65-1315	Bullfrog Spa
65-1945	Bullfrog Spa
39583	Watkins / Caldera (Wavemaster 6000)
06117849-1	Watkins (39583)
36745	Wavemaster 5000
06115007-5	Aqua-Flo
06615456-2	Aqua-Flo
06617763-2	Aqua-Flo
630-6087	Various
101293	Various
1-00-0133	Various
15-200-1500	Various
305642	Various
3420613	Waterway alternate
3J20610	Waterway alternate
5175-201	Various

⚠️ Important: Some cross-reference part numbers listed above may include 230V/115V dual-voltage configurations. Always confirm your existing pump’s voltage before ordering. Using the wrong voltage will damage the motor. When matching pumps, always use amperage rather than horsepower as the primary comparison metric — many times the labeled horsepower does not accurately represent actual horsepower.

🛠️ Installation Requirements

Mounting:

Requirement	Specification
Mounting Position	Horizontal — Place on level surface
Location	Below water surface (flooded suction)
Area	Clear of direct water with adequate floor drainage
Protection	Protect from excessive moisture
Restriction	Do not install within an outer enclosure or beneath the skirt of a spa unless so marked

Plumbing:

Connection	Size
Suction (Intake)	2″ Male Union Thread — Center
Discharge	2″ Male Union Thread — Side
Thread OD	Approximately 3-1/16″
Tailpiece	Use Waterway tailpiece assemblies for best connection
Union Tightening	Hand tighten only

Installation Notes:

⚠️ Install shut-off valves on both the inlet and outlet for future maintenance access

⚠️ Do not use pipe dope — use only Teflon tape or other sealing compounds approved for use with plastic. Some pipe dopes not approved for plastic will cause stress cracking of plastic parts

⚠️ Pressure testing should not exceed 40 PSI — ensure all air is removed during pressure test

⚠️ Cord and plug provided with the pump (if included) is intended for use with a mating spa pack connector

⚠️ Ensure proper grounding and bonding per NEC requirements — ground motor prior to connecting electrical power

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

⚙️ Maintenance Guide

Routine Maintenance:

Task	Frequency	Notes
Check for leaks	Monthly	Around seal, unions, and drain plug
Inspect unions and fittings	Monthly	Hand tighten if needed — do not overtighten
Clean strainer/filter	As needed	Remove debris to maintain flow
Check amperage	Annually	Should be within 10% of nameplate rating
Inspect motor vents	Quarterly	Keep clear of debris for cooling
Check mounting	Quarterly	Ensure pump is secure on level surface
Verify drain plug	Quarterly	Check O-ring (805-0112) condition

Warning Signs — Replace Pump If:

• Unusual noise (grinding, screeching, bearing noise, rotor rub)
• Water leaking from mechanical seal
• Motor trips breaker repeatedly
• Reduced water flow through jets
• Motor overheating or thermal protector tripping repeatedly
• Motor hums but won’t start (possible capacitor or winding switch failure)
• Bent motor shaft

EX2 Wet End Replacement Parts (Waterway OEM):

Part Number	Description
319-3010B	Pump Seal Kit
310-2330	Impeller Assembly — 1.5 HP
319-1270	Wear Ring
311-2311	Volute Faceplate
315-2301	Volute Housing
805-0164	O-Ring #164
715-4020	Pump Drain Plug
805-0112	O-Ring — Pump Drain Plug
819-1110	Screw #8-32
93525105	Replacement Motor
310-2450	Complete Wet End

🎯 Ideal Applications

Application	Suitability	Notes
♨️ Hot tub jet pump	✅ Yes	Designed for larger spa installations with multiple jets
♨️ Spa filtration/circulation	✅ Yes	Low speed provides energy-efficient filtration
♨️ Aqua-Flo XP2/XP2e replacement	✅ Yes	Same volume envelope — direct retrofit
♨️ Wavemaster replacement	✅ Yes	Replaces Wavemaster 5000, 6000, and related models
♨️ Bullfrog spa pump replacement	✅ Yes	Verified replacement for Bullfrog 65-1315 and 65-1945
♨️ Coleman spa pump replacement	✅ Yes	Verified replacement for Coleman 06115511-2
♨️ Watkins/Caldera replacement	✅ Yes	Replaces Watkins 39583 and Relia-Flo pumps

❓ Frequently Asked Questions

Q: What horsepower is this pump? A: 1.5 HP true continuous rated — this is a full-rated horsepower, not an inflated peak or brake HP number.

Q: Will this replace my Aqua-Flo XP2 or XP2e pump? A: Yes. The Waterway EX2 fits within the same physical volume envelope as the Aqua-Flo XP2 and XP2e, making it a direct substitute or retrofit without replumbing. Verify your existing pump’s voltage (115V) and port sizes (2″ x 2″) before ordering.

Q: What is the amperage of this pump? A: The Waterway manufacturer catalog specifies 16.4A high speed / 4.4A low speed with the original A.O. Smith motor. However, Waterway may ship pumps with different motor brands (US Motors, Century, GE, etc.) which may have slightly different amperage ratings (some retailers list 13.5/4.7A or 13.3/4.1A). Always check the motor nameplate on your specific pump for the exact rating. Ensure your circuit breaker and wiring are sized for the highest possible amperage.

Q: What voltage does this pump require? A: 115V / 60Hz. All electrical installation must be performed by a licensed electrician. Do not use on 230V circuits — this will damage the motor.

Q: Are unions included? A: No. Pump unions and tailpieces are sold separately. Waterway recommends using Waterway tailpiece assemblies for the best connection. Hand tighten unions only.

Q: Is a pump cord included? A: No. The cord is sold separately. Reuse your existing pump cord or purchase a compatible 115V spa pump cord.

Q: What size are the ports? A: Both intake and discharge are 2″ male union thread. The outer diameter across the threads measures approximately 3-1/16″ (3.1″).

Q: Can I use this as a single-speed pump? A: Yes. This 2-speed pump can be wired for single-speed operation when connected to a single-speed spa control system.

Q: Is this pump the same physical size as my old Aqua-Flo XP2? A: Yes. The EX2 was specifically designed to fit within the same volume envelope as the Aqua-Flo XP2 and XP2e.

Q: Will the motor always be A.O. Smith brand? A: No. Waterway reserves the right to substitute motor brands without notice. You may receive an A.O. Smith, US Motors, Century, or GE motor. Functionality remains the same regardless of motor brand.

Q: What seal kit do I need for this pump? A: The Waterway EX2 uses pump seal kit 319-3010B. The 1.5 HP impeller assembly is part number 310-2330.

Q: What warranty is included? A: 1-year manufacturer warranty from Waterway Plastics when installed by a qualified installer. Proof of purchase is required. Contact Parts4Tubs for full warranty terms.

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. The manufacturer specifies a GFCI device with rated residual operating current not exceeding 30mA.

📥 Downloads & Resources

📄 Waterway EX2 Catalog / Specifications (PDF) — Complete EX2 product line specifications, amperage ratings, and performance chart (Document 807-0068.0609)

📄 48/56 Frame Executive, EX2 & Viper Pump Installation Manual (PDF) — Installation instructions, wiring guidance, troubleshooting, safety warnings, and exploded parts diagram (Document 810-0061.1111)

🏆 Why Choose the Waterway EX2

• ✅ Made in the USA — Designed, engineered, and manufactured by Waterway Plastics in Oxnard, California
• ✅ True continuous 1.5 HP — Honest, full-rated horsepower for reliable jet performance
• ✅ UL and CUL certified — Safety certified for the US and Canadian markets (UL File No. E128519)
• ✅ Direct XP2/XP2e replacement — Same envelope, no replumbing required
• ✅ 2-speed energy savings — Low speed filtration dramatically reduces electricity costs
• ✅ Designed for more jets — Built for larger spa installations with high jet count demands
• ✅ 1-year manufacturer warranty — Factory-backed warranty from Waterway Plastics

🤝 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 in USD
• ✅ Full warranty support
• ✅ Hassle-free returns
• ✅ Replacement seals, wet ends, impellers, and parts available
• ✅ Dedicated customer service team

💧 Summary

The Waterway EX2 3420610-1U is a USA-made, 1.5 HP true continuous rated, 2-speed jet pump built for demanding spa installations. Operating at 115V/60Hz with UL/CUL certification, it serves as a direct drop-in replacement for Aqua-Flo XP2, XP2e, Wavemaster 5000/6000, and dozens of Watkins, Coleman, and Bullfrog spa pump models. Its 48-frame, 2″ x 2″ side discharge configuration with same-envelope fitment means no replumbing is needed. Backed by a 1-year Waterway factory warranty — order today from Parts4Tubs for fast US shipping and expert 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
	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.