Product Description

LX 4HP 2-Speed Spa Pump — Get Your Hot Tub Running Again
A dead or underperforming pump doesn't have to mean the end of your spa experience. The LX 4HP 2-Speed 56 Frame Pump (56WUA400-II) is a trusted, high-performance replacement pump that fits a wide range of hot tub brands — and Western Tub and Pool has it ready to ship.
Shop and order at Western Tub and Pool.
[Order Now] [Call Us: 1-855-248-0777]
Why This Pump?
When your spa jets lose pressure or your pump stops working altogether, you need a reliable replacement — fast. The LX 56WUA400-II is a universal aftermarket replacement pump built to match the performance of many original equipment manufacturers, including Aqua-Flo by Gecko, Balboa, and Waterway. It's a proven, cost-effective solution trusted by spa owners and technicians across North America.
Key Features at a Glance
- 4.0 Horsepower for powerful, consistent jet performance
- Dual Speed (2-Speed) operation — high speed for jets, low speed for circulation and energy savings
- 230V / 12A (high) / 3.5A (low) — standard hot tub voltage
- 56Y Frame — the most common frame size in residential spa pumps
- 2" MBT Intake & Discharge (threads measure 3" OD) with side discharge location
- 202 GPM Flow Rate for strong, even water flow across all jets
- Includes unions and cord O-rings — no need to source additional fittings
- Welded steel mounting bracket — standard base design for straightforward installation
- Can be wired as single or dual speed — flexible for different control systems
- 1-Year Manufacturer's Warranty
- 60Hz rating — compatible with standard North American electrical systems
Note: This pump does NOT include a pump cord. A compatible 2-speed pump cord with 4-wire AMP plug is available separately. Contact us if you need help selecting the right cord.
Technical Specifications
|
Specification |
Detail |
|---|---|
|
Model Number |
56WUA400-II |
|
Horsepower |
4.0 HP |
|
Voltage |
230V |
|
Amperage |
12.0A (High) / 3.5A (Low) |
|
Frame Size |
56Y |
|
Hz Rating |
60Hz |
|
Intake Size |
2" MBT (3" OD threads) |
|
Discharge Size |
2" MBT (3" OD threads) |
|
Discharge Location |
Side |
|
Flow Rate |
202 GPM |
|
Speeds |
2-Speed (Dual Speed) |
|
Base Type |
Welded steel mounting bracket |
|
Cord Included |
No (available separately) |
|
Unions Included |
Yes |
|
O-Rings Included |
Yes |
|
Warranty |
1 Year |
Compatible Pump Models — Does This Replace Your Pump?
The LX 56WUA400-II is a universal aftermarket replacement for many popular spa pump models. It may replace the following:
- Waterway 3721621-1D (or any 2" x 2", 4HP, 56 frame Waterway pump)
- Aqua-Flo XP2E 3HP 2" x 2"
- Energy Saver 430-0052
- HydroMaster BX4117-S2
- Power Right PRC-505
- Watkins 1431601-03
- 56WUA400-2/6
Alternate Part Numbers
If your existing pump carries any of the following part numbers, this pump is likely your match:
56WUA400-II, WUA400-II, 56WUA400-11, 56WUA400-ll, WUA400-ll, WUA400-11, LX56WUA400-II, 56WUA400A-II, PUM22901106 (Cal Spa), PUM6BHP, PUM6BHP-56F2S240V, 1-00-0051, HQP-10-0013, 10-56WUA400, 1056WUA400, 77408, 1431601-03, 0982601-03, PUM22000951
Hot Tub Brands That Use This Pump
This pump has been used as OEM and aftermarket equipment in hot tubs from many leading manufacturers, including:
- Cal Spas
- Sundance Spas
- Jacuzzi Spas
- Balboa-equipped spas
- Waterway-equipped spas
- Aqua-Flo / Gecko-equipped spas
- Many additional brands using 56-frame, 2" x 2", 2-speed, 230V pump configurations
Not sure if this pump fits your hot tub? Send us your hot tub's make, model, serial number, or a photo of your existing pump, and our team will confirm compatibility before you order.
Email: fixmytub@gmail.com | Phone: 1-855-248-0777
Frequently Asked Questions
How do I know if this pump will fit my hot tub?
The best way to confirm compatibility is to match your existing pump's part number, frame size (56Y), voltage (230V), amperage (12A), and union connection size (2" MBT). If you're unsure, take a photo of your existing pump's label and send it to fixmytub@gmail.com. Our team will identify the part and confirm the correct replacement.
Does this pump come with everything I need to install it?
The pump includes unions and cord O-rings, which cover most of what you need for a standard swap-out. However, it does NOT include a pump power cord. If your existing cord is not compatible, we can help you source the correct 4-wire AMP connector cord. Check our online catalogue or call 1-855-248-0777.
Can I use this pump as a single-speed pump?
Yes. The LX 56WUA400-II can be wired as either a single-speed or dual-speed pump, depending on your control system. Wiring diagrams for both configurations are available — contact us for guidance.
Is this the right pump for Jacuzzi or Sundance spas with a sliding/clamp base?
No. This version has a permanently welded steel mounting bracket and is NOT compatible with the patented moveable clamp-on base used by some Jacuzzi and Sundance models. If your existing pump has a clamp-style external base, you need the no-base version (56WUA400-II NF). Contact us to confirm which version suits your spa.
My pump is labeled 6HP — is this still the right pump?
Possibly, yes. The LX 56WUA400-II is sometimes relabeled by hot tub manufacturers as 5HP, 6HP, or even 7HP, but the underlying motor is the same: 12 amps at 230 volts (2,760 watts). The sticker does not change the pump's performance. Check your amperage rating — if it reads 12A at 230V, this pump is your match.
I can't find my part number — can you still help?
Absolutely. We specialize in hard-to-find parts. Send us an email at fixmytub@gmail.com with your hot tub's make, model, serial number, and a photo of the existing pump label, and we'll track down the right part for you.
Do you offer tutorials or help with installation?
Yes! Western Tub and Pool provides free at-home tutorials covering hot tub, swim spa, and pool maintenance. Whether you need guidance on installation or water care, our team is here to help. Call us at 1-855-248-0777 to arrange a visit or consultation.
Can't Find Your Part? We Can Help.
Finding the right replacement part for your hot tub can be frustrating — especially when part numbers are inconsistent or hard to read. That's where Western Tub and Pool comes in.
Here's how to get the right part, fast:
- Check your part number using the list of alternates above
- Send us a photo of your existing pump label or hot tub data plate
- Email your make, model, and serial number to fixmytub@gmail.com
- Call our team at 1-855-248-0777 — we'll identify the part and confirm availability
We carry pumps, controls, heaters, jets, and all the replacement parts your spa needs to run at its best. Browse our full catalogue online or contact us directly.
Shop and Order at Western Tub and Pool
Whether you know exactly what you need or you're starting from scratch with just a model number, our team is ready to help.
[Order This Pump Now] [Browse Our Full Catalogue]
Phone: 1-855-248-0777
Email:fixmytub@gmail.com
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