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

�� 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. Showing 1 – 5 of 5 results Showing all 5 results Showing the single result No results found Sort by Price low to high Sort by Popularity Sort by Rating Sort by Price low to high Sort by Price high to low Sort by Newness Sort by Name A - Z Sort by Name Z - A Filters Sort results Reset Apply Magic Plastics Union 0602-15 (1.5″ Pump Union) | 1-1/2″S x 1-1/2″FBTUnion, Pump, Magic, 1-1/2"S x 1-1/2"FBT (Industry Standard) w/ O-Ring $6.36 Max: 475 Min: 1 Step: 1 Add to cartMagic Plastics Union 0602-20 (2″ Pump Union) | 2″S x 2″FBT w/ O-RingUnion, Pump, Magic, 2"S x 2"FBT (Industry Standard) w/ O-Ring $8.00 Max: 959 Min: 1 Step: 1 Add to cartWaterway Union 400-6010 | 2-1/2″ Union Nut with 2-1/2″ Slip tailpiece and o-ring (2.5″ union)Union, Pump, Waterway, 2-1/2"FBT x 2-1/2"S $14.77 Max: 146 Min: 1 Step: 1 Add to cart1 Speed Pump / Blower / AMP Cord | 21086Amp Plug, Pump, 1-Speed, 14/3, 4-Pin, 5' Cord, White $24.71 Max: 432 Min: 1 Step: 1 Add to cartBalboa Amp Plug 21087 (For 2 Speed Pumps)Amp Plug, Pump 1 (2-Speed) 14/4, 72" Long, White $31.72 Max: 216 Min: 1 Step: 1 Add to cart Hot Tub Pump Collar & Union Size Chart Hot Tub Pump Collar & Union Size Chart Imperial & Metric Specifications Union Size Collar Size Thread OD Union OD O-Ring Size 1.5" Female ButtressThread (FBT) 2.5" / 64mm (Tip to Tip)Measurement 2-1/2" 64mm 2-13/16" 71mm 2-5/16" OD 59mm 2" Female ButtressThread (FBT) 3.1" / 78mm (Tip to Tip)Measurement 3-1/16" 78mm 3-3/8" 81mm 2-15/16" OD 75mm 2.5" Female ButtressThread (FBT) 3.6" / 91mm (Tip to Tip)Measurement 3-5/8" 91mm 4-1/4" 108mm 3-7/16" OD 87mm Important Notes The union "size" (1.5", 2", 2.5") is nominal and doesn't correspond to any actual measurement. Collar size is measured from thread tip to thread tip on the pump outlet. Most hot tub pumps use Female Buttress Thread (FBT) - 98% of applications. O-ring gaskets may vary between manufacturers - measure your existing gasket for accuracy. How do I Replace a Hot Tub Pump? Here's a general step-by-step guide on how to replace a hot tub pump. Keep in mind that the specific steps may vary depending on your hot tub's make and model, so it's essential to consult your hot tub's manual for model-specific instructions. If you're not comfortable with this procedure, it's a good idea to seek professional assistance. Materials You'll Need: Replacement pump Pipe wrench Adjustable wrench Screwdriver Pipe sealant (thread tape or plumber's putty) PVC primer and cement (if you have PVC plumbing) Teflon tape (for threaded connections) Procedure: Turn Off the Power: Before you begin, ensure the hot tub's power supply is turned off at the circuit breaker or disconnect switch. Safety should always be a priority when working with electrical components. Drain the Hot Tub: If your hot tub is not already empty, you'll need to drain it. Follow your hot tub's manual or manufacturer's instructions for proper draining. (You might not need to do this if you can lock the pump off with the gate valves) Locate the Pump: Identify the location of the existing pump in your hot tub. It's usually located near the equipment area or in a designated pump compartment. Disconnect the Electrical Wiring: Carefully disconnect the electrical wiring from the old pump. This typically involves removing the electrical conduit cover, unscrewing wire nuts, and disconnecting the wires from the terminals. Be sure to note the wire connections or take a picture for reference when connecting the new pump. Disconnect the Plumbing: Depending on your hot tub's plumbing setup, you'll need to disconnect the plumbing connections to the pump. Use a pipe wrench or adjustable wrench to loosen and remove the fittings. Be prepared for some water spillage when disconnecting the plumbing. Remove the Old Pump: Once the electrical and plumbing connections are detached, carefully remove the old pump from its mounting position. Some pumps may be secured with mounting brackets or bolts. Prepare the New Pump: If the new pump is not pre-assembled, you may need to attach fittings, unions, or adapters to match your hot tub's plumbing. Ensure that you use the appropriate sealant or Teflon tape on threaded connections to prevent leaks. Mount the New Pump: Position the new pump in the same location as the old one and secure it in place using the mounting brackets or bolts. Reconnect Plumbing: Reconnect the plumbing to the new pump, ensuring that all connections are tight and secure. If your hot tub uses PVC plumbing, use PVC primer and cement to bond the connections properly. Reconnect Electrical Wiring: Reconnect the electrical wiring to the new pump, following the notes or pictures you took earlier. Make sure all wires are properly connected and secure. Turn On the Power: Restore power to the hot tub by switching on the circuit breaker or reconnecting the disconnect switch. Test the Pump: Turn on the hot tub's pump to ensure that it's working correctly. Check for any signs of leaks or irregularities in the plumbing connections. Refill the Hot Tub: Once you've confirmed that the new pump is functioning properly, refill the hot tub with water. Check for Leaks: Inspect the plumbing connections for any leaks. If you find any, turn off the pump, drain the tub again, and reseal the connections as needed. Monitor: Keep an eye on the pump and plumbing for the next few days to ensure everything is functioning correctly and that there are no further issues. Remember that this is a general guideline, and the specific steps may vary based on your hot tub's design. If you're unsure or uncomfortable with any aspect of this process, please do get in touch, happy to help. How do I know what size hot tub pump I have? Determining the size of your hot tub pump is an important step when it comes to maintenance or replacement. To find out the size of your hot tub pump, follow these steps: Check the Manual: The easiest way to determine the size of your hot tub pump is to consult the owner's manual or user documentation that came with your hot tub. The manual typically contains detailed information about the specifications and components of your hot tub, including the pump. Look at the Pump Housing: If you don't have access to the manual or it doesn't provide the information you need, inspect the pump itself. Most hot tub pumps have a label or plate on the pump housing that displays essential details, including the pump's model number, manufacturer, and specifications. You can then send that to me or Google it. Measure the Pump: If the label is missing or damaged, you can measure the pump's dimensions. Measure the diameter of the pump's wet end (the part where the water flows) and the length of the wet end. These measurements can help identify the size and capacity of the pump. Consult the Manufacturer: If you can't find the information on the pump or in the manual, contact the hot tub manufacturer or a reputable dealer. Provide them with your hot tub's model and serial number, and they should be able to identify the correct pump size for your specific hot tub. Online Research: You can also search online using the pump's model number or hot tub's make and model. Many manufacturers provide detailed information about their products on their websites, and you may find specifications for your pump model. Once you have determined the size and specifications of your hot tub pump, you can proceed with maintenance, repairs, or replacement if necessary. Keep in mind that replacing a hot tub pump with the same size and capacity as the original is crucial to ensure proper water circulation and filtration in your hot tub. If you're unsure about any aspect of this process, get in touch, always happy to help.