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Bubbles Supply
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31240

1-3/4" ID x 2" OD Heater O-Ring 31240

Part #: 31240

$2.38
In stock — ships today
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Also replaces

31240
1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this seal/gasket

This 1-3/4" ID x 2" OD heater O-ring is designed specifically for Hot Spring Spas heater assemblies. This genuine OEM replacement part creates the critical seal between heater components, preventing water leaks and maintaining proper heating system pressure in your spa.

Measuring 1-3/4 inches inner diameter and 2 inches outer diameter, this precision-molded O-ring delivers the exact fit your Hot Spring Spas heater requires. At Bubbles Supply, we guarantee this part will fit perfectly, ship same-day from our Canadian warehouse, and include our comprehensive 1-year warranty for complete peace of mind. When replacing your heater O-ring, always drain the spa and allow the heater to cool completely before installation to ensure proper sealing and prevent damage to the new O-ring.

Exact part number

31240

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Also known as / Replaces

This part replaces or is interchangeable with:

  • 1-3/4 ID heater o-ring
  • 31240
  • heater gasket
  • heater o-ring
  • heater seal

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

Common symptoms this part fixes

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

  • Water leaking from heater assembly
  • Spa losing water pressure
  • Heater union weeping or dripping
  • Spa heater throwing a low-flow or pressure error
  • Visible mineral buildup or cracked seal around heater connection

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

Before you buy — quick checklist

  • Confirm your heater assembly uses a 1-3/4" ID x 2" OD o-ring — measure the old one before ordering
  • Check whether the existing o-ring is cracked, flattened, or distorted rather than just dirty
  • Verify this is a Hot Spring Spas heater — this is an OEM part and fitment is brand-specific
  • Inspect the o-ring groove and mating surface for scoring or corrosion before reinstalling
  • Do not reuse the old o-ring — replace it every time the heater is opened

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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