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O-Ring Gasket 711-5120 - Bubbles Supply

O-Ring Gasket 711-5120

Part #: 711-5120

$0.78
In stock — ships today
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this seal/gasket

This Waterway O-Ring Gasket 711-5120 creates a watertight seal for 2-inch union connections in spa plumbing systems. Designed as an OEM replacement part, this precision-molded gasket fits Waterway unions and compatible spa equipment, preventing costly leaks at critical connection points in your hot tub's circulation system.

Built to Waterway's original specifications, this gasket delivers the exact fit you need for reliable, long-lasting repairs. We guarantee precise fitment and back every part with our comprehensive 1-year warranty. Most orders ship the same day for minimal downtime. When installing, ensure the union surfaces are clean and properly aligned—a properly seated O-ring gasket is essential for maintaining optimal water pressure and preventing system damage.

Exact part number

711-5120

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Also known as / Replaces

This part replaces or is interchangeable with:

  • 2-inch union gasket
  • union face gasket
  • union seal ring
  • Waterway union O-ring

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

Technical specifications

Union size
2 inch

Plumbing notes

  • Union size: 2 inch

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 steady leak at a union connection
  • Water pooling under pump or heater equipment pad
  • Loss of system pressure at union joint
  • Visible cracking, flattening, or deformation on existing O-ring
  • Leaking union that won't seal even when hand-tightened

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

Before you buy — quick checklist

  • Confirm your existing union is a Waterway 2-inch union — measure the pipe OD and check the union body for a Waterway stamp or part number
  • Inspect the union seat faces for scoring or cracks — a new O-ring won't seal against a damaged seat
  • Verify the O-ring groove is clean and free of old gasket material before installing
  • Check whether the leak is at the O-ring face or at the union nut threads — a thread leak requires a different fix

Reading the checklist now prevents 90% of returns. Worth the 60 seconds.

Install difficulty: Easy — DIY-friendlyTypically 10-20 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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