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Waterway Executive 56 Spa Pump 4 HP 230V 2-Speed – 2½-Inch Intake, 2-Inch Discharge, 3721621-13 | Northline Parts
  • Waterway Executive 56 Spa Pump 4 HP 230V 2-Speed – 2½-Inch Intake, 2-Inch Discharge, 3721621-13 | Northline Parts
  • 4 HP 230V 2-Speed Executive 56 Frame Spa Pump Black Side Discharge 3721621-13 - aftermarket replacement part from Northline Parts
  • 4 HP 230V 2-Speed Executive 56 Frame Spa Pump Black Side Discharge 3721621-13 - aftermarket replacement part from Northline Parts
  • 4 HP 230V 2-Speed Executive 56 Frame Spa Pump Black Side Discharge 3721621-13 - aftermarket replacement part from Northline Parts
  • 4 HP 230V 2-Speed Executive 56 Frame Spa Pump Black Side Discharge 3721621-13 - aftermarket replacement part from Northline Parts
  • 4 HP 230V 2-Speed Executive 56 Frame Spa Pump Black Side Discharge 3721621-13 - aftermarket replacement part from Northline Parts
  • 4 HP 230V 2-Speed Executive 56 Frame Spa Pump Black Side Discharge 3721621-13 - aftermarket replacement part from Northline Parts
  • 4 HP 230V 2-Speed Executive 56 Frame Spa Pump Black Side Discharge 3721621-13 - aftermarket replacement part from Northline Parts
  • 4 HP 230V 2-Speed Executive 56 Frame Spa Pump Black Side Discharge 3721621-13 - aftermarket replacement part from Northline Parts
Waterway Executive 56 Spa Pump 4 HP 230V 2-Speed – 2½-Inch Intake, 2-Inch Discharge, 3721621-13

Waterway Executive 56 Spa Pump 4 HP 230V 2-Speed – 2½-Inch Intake, 2-Inch Discharge, 3721621-13

SKU: NLT2S00784
$419.99 In Stock
$419.99
$419.99
Ships for free in 2–4 business days.
This replacement Waterway Executive 56 spa pump matches part number #3721621-13. It has a 4 HP, 230V two-speed motor with a 2½-inch suction connection and 2-inch side discharge.
Estimated delivery between
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Compatible Models

We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.

Compatible equipment / model
  • Hot tubs and spas using Waterway Executive 56 3721621-13 or verified ME-40226-25 replacement and identical plumbing/electrical setup

We do our best to list all compatible models. Model year alone does not guarantee fit; check plumbing thread sizes, wet-end position, 56-frame mounting and electrical connections. The similar 3721621-1D uses a different 2-inch inlet.

Product Overview

The pump moves water through the hot tub plumbing, supporting both circulation and higher-flow jet operation.

A worn motor or leaking pump seal can cause noisy operation, poor jet flow, tripped breakers or water loss near the wet end. Pump horsepower alone is not enough to identify a suitable replacement.

Check plumbing thread sizes, wet-end position, 56-frame mounting and electrical connections. The similar 3721621-1D uses a different 2-inch inlet.

Key Features & Performance

  • 4 HP
  • Product-specific configuration: 4 HP; 230V; 2 speeds; 56 frame; 2.5-inch suction; 2-inch discharge; side outlet
  • Purpose: The pump moves water through the hot tub plumbing, supporting both circulation and higher-flow jet operation.

Specifications

  • Northline Parts SKU: NLT2S00784
  • 4 HP
  • 230V
  • 2 speeds
  • 56 frame
  • 2.5-inch suction
  • 2-inch discharge
  • side outlet
  • Horsepower: 4 HP
  • Voltage: 230V
  • Speeds: 2-Speed
  • OEM / manufacturer references (identification only): 3721621-13, ME-40226-25

Replaces / Cross-References

  • 3721621-13
  • ME-40226-25

Numbers above are identification references only; replacement claims apply when the entire configuration matches.

Installation & Fitment Notes

Check plumbing thread sizes, wet-end position, 56-frame mounting and electrical connections. The similar 3721621-1D uses a different 2-inch inlet.

Before fitting the replacement, compare it directly with the removed part, including size, attachment points and any electrical or hydraulic connections. Follow the equipment manufacturer’s repair instructions.

Frequently Asked Questions

Is this an OEM part?

This listing is for an aftermarket replacement or accessory unless its original product documentation expressly states otherwise. Manufacturer names and numbers identify compatible applications only.

How do I confirm this will fit?

Check plumbing thread sizes, wet-end position, 56-frame mounting and electrical connections. The similar 3721621-1D uses a different 2-inch inlet.

What should I check before replacing the original part?

A worn motor or leaking pump seal can cause noisy operation, poor jet flow, tripped breakers or water loss near the wet end. Pump horsepower alone is not enough to identify a suitable replacement.

Part Summary

Part: Waterway Executive 56 Spa Pump 4 HP 230V 2-Speed – 2½-Inch Intake, 2-Inch Discharge, 3721621-13

Application: Hot tubs and spas using Waterway Executive 56 3721621-13 or verified ME-40226-25 replacement and identical plumbing/electrical setup

Function: The pump moves water through the hot tub plumbing, supporting both circulation and higher-flow jet operation.

Northline Parts SKU: NLT2S00784

OEM / Reference Numbers: 3721621-13, ME-40226-25

Keywords: Waterway Executive 56 Spa Pump 4 HP 230V 2-Speed – 2½-Inch Intake, 2-Inch Discharge, 3721621-13, NLT2S00784, Northline Parts, 3721621-13, ME-40226-25

Fitment disclaimer: Brand names and original part numbers are for identification only. Confirm dimensions, configuration and applicable model before installation.

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