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2HP 3-1/4" SL x 4-1/4" OD Impeller 05-3865-03-R 2.00HP - Bubbles Supply

2HP 3-1/4" SL x 4-1/4" OD Impeller 05-3865-03-R

Part #: 05-3865-03-R

$61.78
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this impeller

This genuine Jacuzzi impeller (part #05-3865-03-R) is designed for 2HP J-Series, JCM-Series, and K-Series spa pumps. Featuring precise 3-1/4" shaft length and 4-1/4" outer diameter specifications, this OEM replacement delivers the exact performance your Jacuzzi spa requires for optimal water circulation and filtration.

At Bubbles Supply, we guarantee this impeller will fit your pump perfectly – no guesswork, no returns. Every genuine Jacuzzi part ships same-day from our Canadian warehouse and includes our comprehensive 1-year warranty for complete peace of mind. When your spa's circulation feels weak or you hear unusual pump noise, this impeller often provides the solution. Always verify your current impeller's measurements and pump model before ordering to ensure proper fitment.

Exact part number

05-3865-03-R

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 05-3865-03-R
  • J-Series impeller
  • Jacuzzi impeller
  • JCM impeller
  • K-Series impeller

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

Technical specifications

Horsepower
2.0 HP

Common symptoms this part fixes

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

  • Weak or reduced water flow from jets
  • Unusual grinding or rattling noise from pump
  • Pump runs but jets have little to no pressure
  • Visible damage, cracking, or wear on existing impeller vanes
  • Poor circulation causing water clarity issues

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

Before you buy — quick checklist

  • Measure your existing impeller — confirm 3-1/4" shaft length and 4-1/4" outer diameter before ordering
  • Verify your pump model is J-Series, JCM-Series, or K-Series — check the pump label directly
  • Confirm your pump is rated at 2 HP — using an impeller mismatched to HP will cause poor performance or damage
  • Inspect the pump diffuser and seal plate for damage before reassembling — replace worn components at the same time
  • Note the rotation direction of your existing impeller before removal to ensure correct reinstallation

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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