🚀 New launch promo — 10% off orders over $300. Use code LAUNCH10
Bubbles Supply
Not sure which part you need? Upload a photo and we'll find it. →
4HP 3" SL x 4-13/16" OD Impeller IMP-56WUA400 4.00HP - Bubbles Supply

4HP 3" SL x 4-13/16" OD Impeller IMP-56WUA400

Part #: IMP-56WUA400

$27.28
In stock — ships today
Qty
🔒 Secure checkout↩️ 30-day returns✅ 1-year warranty
Add to B2B order list

Not sure this fits?

Send us a photo of your old part — we'll confirm the right replacement before you order.

Upload a Photo
1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this impeller

This 4HP impeller is designed for LX 56-frame main pumps, delivering the power boost needed when your spa's circulation has weakened or failed completely. The 56WUA model fits the newer style 56-frame pump housing with its precise 3" suction line connection and 4-13/16" outside diameter.

Built to LX's OEM specifications, this replacement impeller restores full water flow and pressure to get your spa running like new. At Bubbles Supply, we guarantee an exact fit for your pump and ship the same day you order. Every impeller comes with our comprehensive 1-year warranty for complete peace of mind. Double-check your existing impeller's diameter and suction line size before installation to ensure proper fitment with your pump housing.

Exact part number

IMP-56WUA400

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 4HP 56-frame impeller
  • LX 56WUA400 impeller
  • WUA400 impeller

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

Technical specifications

Horsepower
4.0 HP
Frame size
56 frame

Common symptoms this part fixes

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

  • Weak or reduced jet pressure
  • No water flow despite pump running
  • Pump runs but spa won't heat due to insufficient circulation
  • Visibly cracked or chipped impeller on inspection
  • Excessive pump noise caused by impeller damage or cavitation

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

Before you buy — quick checklist

  • Confirm your existing impeller's outside diameter is 4-13/16" before ordering
  • Verify your suction inlet is 3" SL (straight) — not threaded or a different diameter
  • Confirm your pump is an LX 56-frame model — check the pump label or housing stamp
  • Inspect the pump seal and wear ring while disassembled — replace if worn to avoid repeat failure
  • Make sure the symptom is the impeller and not the motor or capacitor before ordering

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

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

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.

🔒 Secure checkout · SSL encrypted·🇺🇸🇨🇦 Serving the US and Canada·↩️ 30-day hassle-free returns·📦 Same-day fulfillment