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2-1/4" ID x 2-1/2" OD O-Ring 2540-294 - Bubbles Supply

2-1/4" ID x 2-1/2" OD O-Ring 2540-294

Part #: 2540-294

$4.32
In stock — ships today
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🔒 Secure checkout↩️ 30-day returns✅ 1-year warranty
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Fits these systems

Sundance Spas

Not seeing your system? Send us a photo for a free ID.

Also replaces

2540-294
1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

Before you buy — quick checklist

  • Measure your existing O-ring ID, OD, and cross-section before ordering — confirm 2-1/4" ID x 2-1/2" OD x 1/8" cross-section
  • Verify the leaking fitting is a 2-inch union — smaller 1-1/2" unions use a different O-ring
  • Inspect the union face and threads for cracking or damage that an O-ring alone won't fix
  • Check that the union nut is not cross-threaded or cracked before replacing the O-ring
  • Confirm this is an OEM Sundance Spas plumbing union — aftermarket unions may use non-standard O-ring dimensions

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

Exact part number

2540-294

Save this for ordering or warranty claims

Technical specifications

Union size
2 inch union connections

Plumbing notes

  • Union size: 2 inch 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:

  • Active water leak at a 2-inch union fitting
  • Wet cabinet floor or equipment bay pooling
  • Union joint weeping after tightening
  • Visible O-ring cracking, flattening, or extrusion at union face
  • Chemical or heat-related seal failure causing slow drip

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

About this seal/gasket

This genuine Sundance Spas O-ring creates a watertight seal for 2-inch union connections in your spa's plumbing system. Measuring 2-1/4" inner diameter, 2-1/2" outer diameter with a 1/8" cross section, this OEM replacement part maintains the precise tolerances your Sundance spa was designed with. Quality rubber construction resists chlorine, heat, and chemical degradation for reliable long-term performance.

At Bubbles Supply, we guarantee exact fit compatibility and back every O-ring with our comprehensive 1-year warranty. Orders ship same-day to get your spa running quickly. When installing, ensure the union surface is clean and dry, and apply a thin layer of silicone lubricant to prevent pinching during assembly. Always inspect O-rings for nicks or stretching before installation to maintain optimal seal integrity.

Also known as / Replaces

This part replaces or is interchangeable with:

  • 2-inch union O-ring
  • 2" union O-ring

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

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.

AI Fitment Assistant

Tell us your spa model and we will confirm this part fits before you buy.

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