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Pump/Heater Union O-Ring Gasket 711-6020 - Bubbles Supply

Pump/Heater Union O-Ring Gasket 711-6020

Part #: 711-6020

$1.46
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this seal/gasket

The Waterway Pump/Heater Union O-Ring Gasket 711-6020 is a critical seal component for 2-1/2" pump and heater unions in spa plumbing systems. This OEM replacement gasket prevents water leaks at connection points between your spa's circulation pump and heater assembly, ensuring efficient operation and preventing costly water damage.

Manufactured to Waterway's exact specifications, this precision-molded o-ring delivers reliable performance you can count on. At Bubbles Supply, we guarantee an exact fit for your spa system and back every gasket with our comprehensive 1-year warranty. Orders ship the same day for minimal downtime. When installing, ensure all union surfaces are clean and free of debris, and hand-tighten the union only until the o-ring compresses slightly – over-tightening can damage the seal.

Exact part number

711-6020

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Also known as / Replaces

This part replaces or is interchangeable with:

  • 2-1/2 inch union o-ring
  • heater union seal
  • plumbing union o-ring
  • pump union gasket

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

Technical specifications

Union size
2-1/2 inch pump and heater unions

Plumbing notes

  • Union size: 2-1/2 inch pump and heater unions

Need help measuring? Email hello@bubblessupply.com with a photo of your existing plumbing.

Common symptoms this part fixes

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

  • Slow drip or steady leak at pump or heater union connection
  • Water pooling in equipment bay near pump or heater
  • Visible mineral buildup or staining at union joint
  • Loss of water pressure due to union seal failure
  • Union leaks after retightening but won't seal

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

Before you buy — quick checklist

  • Confirm your pump or heater union is 2-1/2 inch — measure the union body, not the pipe
  • Inspect the old o-ring for the failure mode: cracking and brittleness suggest heat degradation, flat-spotting suggests over-tightening
  • Check that the union nut and tail piece threads are undamaged before replacing the o-ring alone
  • Verify this is the union o-ring and not the union face gasket — they are different parts at the same connection
  • If you're replacing one side, inspect both the pump-side and heater-side unions while the system is drained

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

Install difficulty: Easy — DIY-friendlyTypically 15-30 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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