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2-3/16" ID x 2-7/8" OD Heater O-Ring 0301-229 - Bubbles Supply

2-3/16" ID x 2-7/8" OD Heater O-Ring 0301-229

Part #: 0301-229

$2.92
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this seal/gasket

The Magic Plastics 2-3/16" ID x 2-7/8" OD Heater O-Ring (part #0301-229) is a precision-engineered replacement seal designed for spa heater assemblies. This critical component creates a watertight seal between heater union connections, preventing leaks and maintaining proper water flow through your spa's heating system. The specific 2-3/16" inner diameter and 2-7/8" outer diameter dimensions ensure compatibility with various spa heater configurations.

Manufactured by Magic Plastics to OEM specifications, this heater O-ring delivers the exact fit you need to restore your spa's heating performance. We guarantee precise fitment and back every part with our 1-year warranty, plus same-day shipping to get your spa running quickly. When installing, ensure the O-ring groove is clean and free of debris, and apply a thin layer of silicone lubricant for easy assembly and optimal seal performance.

Exact part number

0301-229

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Also known as / Replaces

This part replaces or is interchangeable with:

  • 2-3/16 heater O-ring
  • heater face seal
  • heater union O-ring
  • spa heater gasket

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 union connections
  • Dripping at heater manifold fittings
  • Spa losing water level without visible plumbing break
  • Wet insulation or corrosion around heater housing
  • Heater cycling off due to low flow caused by air ingestion at leaking union

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

Before you buy — quick checklist

  • Measure your existing O-ring ID and OD before ordering — confirm 2-3/16" ID and 2-7/8" OD match your heater union groove
  • Inspect the O-ring groove for cracking, debris, or mineral buildup — a damaged groove seat may require additional repair
  • Confirm this is the heater union O-ring and not an internal heater tube seal — these are different parts
  • Check whether your heater uses a face-seal or groove-seated O-ring to ensure this style matches your assembly
  • Have silicone-based lubricant on hand before starting — do not use petroleum-based grease on EPDM or silicone O-rings

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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