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1-1/2" ID x 2-5/16" OD Heater Gakset 711-4000 - Bubbles Supply

1-1/2" ID x 2-5/16" OD Heater Gakset 711-4000

Part #: 711-4000

$1.51
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this heater

This Waterway heater gasket creates a watertight seal between your spa's heater union connections. Designed for 1-1/2" ID applications with a 2-5/16" outer diameter, this flat gasket prevents costly water leaks that can damage your spa's heating system. When your original gasket becomes brittle or warped from heat exposure, this OEM replacement restores proper sealing performance in Waterway heater assemblies.

Our exact fit guarantee ensures this gasket matches your original specifications perfectly, eliminating guesswork during repairs. Every gasket ships same-day when ordered before our cutoff time and includes our full 1-year warranty for complete peace of mind. Whether you're fixing a dripping heater union or performing preventive maintenance, this genuine Waterway part delivers reliable long-term performance. Always inspect heater union threads and apply appropriate sealant according to manufacturer specifications during installation.

Exact part number

711-4000

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Also known as / Replaces

This part replaces or is interchangeable with:

  • 1-1/2 inch heater gasket
  • flat heater gasket
  • heater connection gasket
  • heater union gasket

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:

  • Dripping or weeping at heater union connection
  • Water pooling beneath heater assembly
  • Visible mineral deposits or staining around heater unions
  • Soft or collapsed gasket on inspection
  • Cracked or brittle gasket from prolonged heat exposure

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

Before you buy — quick checklist

  • Measure your existing gasket — confirm 1-1/2" ID and 2-5/16" OD before ordering
  • Verify your heater uses Waterway union fittings, not a competing brand's union style
  • Inspect union threads for cracking or cross-threading — a new gasket won't seal on damaged threads
  • Check whether leak is at the gasket face or behind the union nut — this gasket only addresses the face seal
  • Drain spa below heater level before attempting any heater union work

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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