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1-1/2" ID x 2-3/8" OD Heater O-Ring 711-4050 - Bubbles Supply

1-1/2" ID x 2-3/8" OD Heater O-Ring 711-4050

Part #: 711-4050

$1.62
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this seal/gasket

This genuine Waterway heater O-ring provides a reliable seal for 1-1/2" heater unions on most residential spa systems. Measuring 1-1/2" inner diameter by 2-3/8" outer diameter, this OEM replacement gasket restores proper sealing between heater components, preventing costly water leaks and maintaining optimal heating performance.

Engineered to Waterway's exact specifications, this precision-molded O-ring delivers the exact fit guaranteed you need for lasting repairs. We ship same-day from our Canadian warehouse and back every part with our comprehensive 1-year warranty for complete peace of mind. Essential for both routine maintenance and emergency repairs, this gasket fits standard Waterway heater configurations found in thousands of spa installations. Always verify your existing O-ring dimensions before ordering to ensure proper fitment.

Exact part number

711-4050

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Also known as / Replaces

This part replaces or is interchangeable with:

  • 1-1/2 inch heater O-ring
  • heater gasket
  • Heater union O-ring
  • union face seal

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

Technical specifications

Union size
1-1/2 inch heater unions

Plumbing notes

  • Union size: 1-1/2 inch 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:

  • Water leaking from heater union connection
  • Wet cabinet floor near heater manifold
  • Heater losing prime due to air ingestion at union seal
  • Visible mineral buildup or cracking on existing O-ring
  • Soft or flattened O-ring that no longer seats properly

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

Before you buy — quick checklist

  • Measure your existing O-ring — confirm 1-1/2" ID and 2-3/8" OD before ordering
  • Check that your heater uses standard union-style connections, not a glued or threaded manifold
  • Inspect union nut and union body for cracking or thread damage — a new O-ring won't fix a damaged union
  • Verify this is the correct O-ring position (face seal vs. groove-mounted) on your specific heater assembly

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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