LX 56WUA400-II 4.0 HP Hot Tub Pump – 230V 2-Speed | Waterway Executive & Aqua-Flo XP2e Replacement

Product Description

Restore powerful hydrotherapy jet performance and reliable spa circulation with the LX 56WUA400-II 4.0 HP Hot Tub Pump. This heavy-duty, 230V two-speed spa pump is designed as a replacement for a wide range of popular hot tub pumps, including select Waterway Executive 56, Gecko Aqua-Flo XP2e, Sundance, Watkins, HydroMaster, and Energy Saver models.

Manufactured by LX (Lingxiao), the 56WUA400-II features a durable 56-frame motor, dual-capacitor design, and high-performance wet end engineered to deliver strong water flow for demanding hot tub applications.

Operating at approximately 3450 RPM on high speed and 1725 RPM on low speed, this versatile pump provides powerful water movement for hydrotherapy jets while supporting circulation and filtration in compatible spa systems.

With a 12.0-amp high-speed rating, 4.4-amp low-speed rating, and maximum advertised flow of approximately 202 GPM, the LX 56WUA400-II offers dependable performance for many residential hot tubs.

Its 2-inch center suction and 2-inch side-discharge plumbing configuration makes it a popular alternative to several discontinued or expensive original spa pumps.

Features & Benefits

Powerful 4.0 HP Spa Pump: Delivers strong water flow for hydrotherapy jets and high-performance hot tub applications.

Two-Speed Operation: High speed provides powerful jet action, while low speed supports water circulation and filtration.

230V Motor: Designed for 220–240V electrical systems commonly found in residential hot tubs.

Heavy-Duty 56-Frame Motor: Durable motor construction designed for dependable spa pump operation.

Wide Replacement Compatibility: Can replace select Waterway Executive, Aqua-Flo XP2e, Sundance, Watkins, HydroMaster, and other compatible spa pumps.

High-Performance Water Flow: Rated for up to approximately 202 gallons per minute under specified operating conditions.

2-Inch Plumbing Connections: Center suction and side discharge with standard 2-inch union connections.

Dual-Capacitor Motor: Designed for reliable starting and consistent pump operation.

Durable Motor Construction: Features copper motor windings, thermal protection, and bearings designed for quiet, dependable operation.

Unions & O-Rings Included: Supplied with plumbing unions and seals for installation.

Specifications

Brand: LX / Lingxiao

Manufacturer Part Number: 56WUA400-II

Alternate Part Numbers: LX56WUA400-II, LX56WUA400II, WUA400-II

Product Type: Hot Tub / Spa Jet Pump

Horsepower: 4.0 HP

Voltage: 220–240V

Frequency: 60Hz

Motor Frame: 56 Frame

Motor Type: Dual Capacitor

Speeds: 2-Speed

High Speed RPM: 3450

Low Speed RPM: 1725

High Speed Amperage: 12.0 Amps

Low Speed Amperage: 4.4 Amps

Maximum Advertised Flow Rate: 202 GPM / 765 LPM

Suction Connection: 2-Inch Center Suction

Discharge Connection: 2-Inch Side Discharge

Union Thread Outside Diameter: Approximately 3 Inches

Overall Length: 16-7/16 Inches

Overall Width: 8-3/4 Inches

Overall Height: 8-7/8 Inches

Power Cord Included: No

Unions & O-Rings Included: Yes

Warranty: 1-Year Limited Warranty

Replacement Pump Compatibility & Cross-Reference Part Numbers

The LX 56WUA400-II is commonly used as an aftermarket replacement for the following spa pump models and part numbers.

Gecko / Aqua-Flo XP2e Pumps

05334012-2040

05340009-5040

Select Aqua-Flo XP2e 4.0 HP, 230V, two-speed pumps with 2-inch plumbing connections.

Waterway Executive 56 Pumps

3721621-1D

3721621-1W

3M21621-1W

Select Waterway Executive 56-frame, 230V, two-speed pumps with compatible electrical and plumbing specifications.

Sundance Spa Pumps

6500-352

Watkins Spa Pumps

1431601-03

1431601-revA

0982601-03

HydroMaster Pumps

BX4117-S2

Energy Saver Spa Pumps

430-0052

Additional Replacement & Cross-Reference Numbers

1016024

1016084

956815

Power Right PRC-505

PUM22901106

PUM22000951

PUM6BHP

PUM6BHP-56F2S240V

1-00-0051

HQP-10-0013

10-56WUA400

1056WUA400

56WUA400-2/6

56WUA400A-II

34-343-1045

These are published aftermarket replacement references. Compatibility is not guaranteed by part number alone. Some installations may require plumbing adjustments or different unions.

Compatible Hot Tub Brands

Depending on the original pump configuration, the LX 56WUA400-II may be suitable for select hot tubs manufactured by:

Cal Spas

Sundance Spas

Jacuzzi Spas

Master Spas

Other hot tubs equipped with compatible Waterway Executive, Aqua-Flo XP2e, or 56-frame two-speed pumps.

Always verify your original pump specifications before ordering.

Important Waterway Executive Replacement Information

The LX 56WUA400-II is a popular replacement for Waterway Executive 56-frame pumps, including part numbers 3721621-1D and 3721621-1W.

However, although the mounting footprint is similar, the LX pump has a smaller wet-end diameter and different plumbing port heights.

When replacing a Waterway Executive pump, the LX discharge connection may sit approximately 3/4 inch lower, while the intake connection may sit approximately 1/2 inch lower.

Minor plumbing modifications may be required to properly align the existing connections.

Important Aqua-Flo XP2e Replacement Information

The LX 56WUA400-II is also designed as a replacement for select Gecko Aqua-Flo XP2e pumps, including part number 05334012-2040.

Its wet-end dimensions and plumbing layout are similar to compatible XP2e models, making it a convenient alternative when replacing a failed spa pump.

Always verify the original pump's voltage, amperage, connection sizes, and discharge orientation.

What's Included

LX 56WUA400-II 4.0 HP Two-Speed Hot Tub Pump

Two 2-Inch Plumbing Unions

Two Union O-Rings

Installation and Wiring Instructions

Power cord is not included.

Frequently Asked Questions

What pumps does the LX 56WUA400-II replace?

The LX 56WUA400-II can replace numerous compatible spa pumps, including Waterway Executive 3721621-1D and 3721621-1W, Aqua-Flo XP2e 05334012-2040, Sundance 6500-352, Watkins 1431601-03, HydroMaster BX4117-S2, and Energy Saver 430-0052.

Always confirm electrical specifications and plumbing dimensions before purchasing.

Will the LX 56WUA400-II replace my Waterway Executive pump?

Yes, it is a replacement option for select Waterway Executive 56-frame pumps. However, plumbing adjustments may be required because the intake and discharge connections are positioned slightly differently.

Is the LX 56WUA400-II compatible with Aqua-Flo XP2e pumps?

Yes. It is commonly used to replace select Aqua-Flo XP2e models, including 05334012-2040. Verify the original pump's specifications and plumbing layout before ordering.

Can I replace a 3 HP pump with this 4 HP LX pump?

Possibly. Hot tub pump horsepower ratings can vary between manufacturers and may represent different rating methods. Compare the original pump's voltage, amperage, motor speed, plumbing configuration, and performance requirements rather than relying on horsepower alone.

What size plumbing connections does this pump have?

This version of the LX 56WUA400-II features 2-inch center suction and 2-inch side-discharge connections. The outside diameter of the union threads measures approximately 3 inches.

Is this a two-speed spa pump?

Yes. The pump operates at approximately 3450 RPM on high speed and 1725 RPM on low speed.

Does the LX 56WUA400-II include unions?

Yes. Two plumbing unions and O-rings are included. An electrical power cord is not included.

Can this pump replace a single-speed hot tub pump?

In certain applications, it may be possible to use a compatible two-speed pump as a single-speed replacement by connecting only the high-speed circuit. Electrical compatibility must be confirmed by a qualified technician.

Does this pump have a warranty?

The LX 56WUA400-II is commonly offered with a one-year limited warranty. Refer to the applicable seller and manufacturer warranty terms.

Important Ordering Information

Before ordering, compare your existing pump's voltage, high-speed and low-speed amperage, motor frame, plumbing connections, wet-end orientation, and overall dimensions.

This listing is for the 2-inch intake and 2-inch discharge version. Other LX 56WUA400 variants are available with larger plumbing connections and are not necessarily interchangeable.

For older LX pumps manufactured before 2015, metric union threads may differ from current North American standard threads. Replacing existing plumbing unions may be necessary.