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1HP 15/16" SL x 3-1/2" OD Impeller 310-4000 1.00HP - Bubbles Supply

1HP 15/16" SL x 3-1/2" OD Impeller 310-4000

Part #: 310-4000

$52.11
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this impeller

This Waterway Hi-Flo impeller is designed for 1HP spa pumps requiring a 15/16" shaft length and 3-1/2" outer diameter configuration. As an OEM replacement part, it delivers the exact specifications needed to restore proper water circulation in hot tubs and spas equipped with compatible Waterway main pumps.

Built to Waterway's exacting standards, this impeller handles the demanding flow requirements of 1HP pump systems while maintaining optimal hydraulic efficiency. At Bubbles Supply, we guarantee this is the exact fit for your pump specifications and back every purchase with our 1-year warranty plus same-day shipping on in-stock orders. Before installation, always verify your existing impeller's shaft length and outer diameter measurements to ensure proper fitment with your pump housing.

Exact part number

310-4000

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 1HP impeller
  • 310-4000 impeller
  • Waterway Hi-Flo Impeller

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

Technical specifications

Horsepower
1.0 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 no water circulation
  • Impeller visibly cracked, chipped, or worn
  • Cavitation noise from pump housing
  • Pump overheating due to restricted flow
  • Jet pressure drops suddenly during use

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

Before you buy — quick checklist

  • Measure your existing impeller's shaft hole diameter — must be 15/16" for proper fit
  • Measure the outer diameter of your existing impeller — must be 3-1/2"
  • Confirm your pump is rated at 1HP — impellers are HP-specific and not interchangeable across ratings
  • Verify your pump is a Waterway Hi-Flo model before ordering
  • Inspect the pump shaft and seal plate for wear before installing a new impeller — replacing just the impeller won't fix problems caused by a damaged shaft or worn seal

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

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

Warranty

1 year 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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