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56Y Frame 2" MBT x 2-1/2" MBT Wet End WE-56WUA400B-II 4.00HP - Bubbles Supply

56Y Frame 2" MBT x 2-1/2" MBT Wet End WE-56WUA400B-II

Part #: WE-56WUA400B-II

$55.44
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this wet end

This LX wet end assembly is designed for 4.0 HP spa pumps with 56Y frame motors, featuring 2" MBT suction and 2-1/2" MBT discharge connections. Built to OEM specifications, this genuine LX replacement part delivers the reliable performance your spa system demands. The WE-56WUA400B-II wet end handles high-flow applications while maintaining optimal hydraulic efficiency.

At Bubbles Supply, we guarantee this wet end will fit your LX pump exactly as specified. Every order ships the same day from our Canadian facility, backed by our comprehensive 1-year warranty for complete peace of mind. Whether you're a spa technician or maintaining your own system, you can count on authentic LX quality and our expert support. Verify your pump's frame size and connection measurements before installation to ensure proper fit.

Exact part number

WE-56WUA400B-II

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Also known as / Replaces

This part replaces or is interchangeable with:

  • 56Y wet end assembly
  • LX 4HP wet end
  • WUA400B-II wet end

Looking for an older part number? Check our supersession lookup tool

Technical specifications

Horsepower
4.0 HP
Frame size
56Y

Common symptoms this part fixes

If your spa is showing any of these signs, this part is likely your fix:

  • Pump leaking from volute or seal area
  • Low water flow despite motor running normally
  • Loud grinding or cavitation noise from pump housing
  • Cracked or damaged impeller housing
  • Impeller seized or broken
  • Pump losing prime repeatedly

Not sure if this is your problem? Try our diagnostic centre or .

Before you buy — quick checklist

  • Confirm your existing motor is a 56Y frame — check the motor nameplate
  • Verify suction port is 2" MBT and discharge port is 2-1/2" MBT before ordering
  • Confirm your motor shaft diameter and rotation direction match this wet end
  • Inspect the existing motor — if the motor itself is failed, this wet end alone will not fix it
  • Check that your existing plumbing unions will mate with MBT-style fittings

Reading the checklist now prevents 90% of returns. Worth the 60 seconds.

Install difficulty: Medium — Some experience neededTypically 45–90 minutes

What's in the box

  • WE-56WUA400B-II wet end assembly
  • Impeller (pre-installed)
  • Mechanical shaft seal
  • Volute O-ring or gasket

If your order is missing any items listed above, contact hello@bubblessupply.com within 48 hours of delivery.

Warranty

1 year manufacturer warranty against defects

Covers manufacturing defects. Does not cover improper installation, normal wear, or accidental damage.

Warranty claims: warranty@bubblessupply.com

Perfect Fit Guarantee

Ordered with our help and the part doesn't fit? Contact us before installation. We'll resolve it with an exchange, replacement recommendation, or return approval.

Learn about our Perfect Fit Guarantee →

Shipping

We ship across the US and Canada. US orders ship from our US warehouse to US customers; Canadian orders ship from our Canadian warehouse to Canadian customers — no cross-border shipping, no surprise duties. In-stock orders placed before 3pm CT ship same day. Standard shipping $9.95 flat rate. Free shipping on orders over $200. Express options available at checkout.

Returns

30-day hassle-free returns on unused parts in original packaging. Contact us before returning to receive your RMA number.

Frequently asked questions

Check the Compatibility section above to confirm fitment for your spa brand and model. If your model is not listed, use our fitment selector at /pages/find-my-part or ask our parts AI for a personalized recommendation.

In-stock orders placed before 3pm CT ship the same day. You will receive tracking information by email as soon as your order ships.

We accept returns within 30 days of delivery for unused items in original packaging. Email returns@bubblessupply.com with your order number to start a return. Installed electrical parts cannot be returned for safety reasons.

Yes, all new parts come with a 1-year warranty against manufacturing defects. Warranty does not cover damage from improper installation or normal wear and tear.

Customer reviews

AI Fitment Assistant

Tell us your spa model and we will confirm this part fits before you buy.

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