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2" ID x 2-1/4" OD Heater O-Ring 42-0045 - Bubbles Supply

2" ID x 2-1/4" OD Heater O-Ring 42-0045

Part #: 42-0045

$0.85
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this seal/gasket

This 2" ID x 2-1/4" OD heater O-ring (part #42-0045) creates a watertight seal in Brett Aqualine spa heater unions. Designed for 1-1/2" heater union connections, this genuine OEM replacement O-ring prevents costly water leaks that can damage your spa's heating system and surrounding components.

Manufactured to Brett Aqualine's exact specifications, this heater union O-ring delivers the precise fit your spa needs to maintain proper water flow and heating efficiency. At Bubbles Supply, we guarantee an exact fit for your heater assembly, ship same-day from our Canadian warehouse, and back every O-ring with our 1-year warranty. Always inspect the union threads and housing for damage before installing your new O-ring to ensure a proper seal.

Exact part number

42-0045

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 2 inch heater O-ring
  • 42-0045 O-ring
  • Heater union O-ring
  • heater union seal

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

Technical specifications

Union size
1-1/2 inch heater union connections

Plumbing notes

  • Union size: 1-1/2 inch heater union connections

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
  • Slow drip at heater manifold that worsens under pressure
  • Visible mineral buildup or cracking around heater union seal
  • Loss of system pressure traced to heater assembly
  • Wet cabinet floor with no obvious plumbing crack

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

Before you buy — quick checklist

  • Confirm your heater union is a Brett Aqualine OEM unit — this O-ring is sized specifically for that assembly
  • Verify the O-ring groove ID and OD before ordering — measure your existing O-ring if it's still intact (should be 2" ID x 2-1/4" OD)
  • Inspect union threads and union nut housing for hairline cracks or stripped threads — a new O-ring won't seal on damaged hardware
  • Check that the union face seat is clean and free of scale buildup before seating the new O-ring
  • Have the spa fully powered down and water level dropped below the heater before attempting the swap

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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