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0.75HP 3-1/4" SL x 3-3/4" OD Impeller 05-3863-05 0.75HP - Bubbles Supply

0.75HP 3-1/4" SL x 3-3/4" OD Impeller 05-3863-05

Part #: 05-3863-05

$59.82
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About this impeller

This genuine Jacuzzi impeller is designed for 0.75HP pumps in J-Series, JCM-Series, and K-Series spas. Built to OEM specifications, this replacement impeller measures 3-1/4" suction length by 3-3/4" outside diameter, delivering the precise water flow your Jacuzzi spa requires for optimal performance.

At Bubbles Supply, we guarantee this impeller provides an exact fit for your compatible Jacuzzi pump, backed by our comprehensive 1-year warranty. Orders ship the same day for fast restoration of your spa's circulation system. Before installation, verify your pump's horsepower rating and measure your existing impeller to confirm proper fitment – incorrect sizing can damage your pump motor or reduce water flow efficiency.

Exact part number

05-3863-05

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 05386305
  • J-Series impeller
  • Jacuzzi pump impeller
  • JCM impeller

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

Technical specifications

Horsepower
0.75 HP

Common symptoms this part fixes

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

  • Weak or low water flow from jets
  • Pump runs but water pressure is reduced
  • Impeller visibly cracked, chipped, or worn
  • Cavitation noise (grinding or rattling from pump housing)
  • Pump pulls correct amperage but flow is inadequate

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

Before you buy — quick checklist

  • Confirm your pump is rated at 0.75 HP — check the label on the motor housing
  • Measure your existing impeller: suction length must be 3-1/4" and outside diameter must be 3-3/4"
  • Verify your spa is a Jacuzzi J-Series, JCM-Series, or K-Series model
  • Inspect the diffuser and wear ring while the pump is open — replace if worn to avoid repeat failures
  • Confirm the pump wet end thread pattern matches 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.

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