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7/16" ID x 11/16" OD O-Ring 6540-263 - Bubbles Supply
Exact Fit

7/16" ID x 11/16" OD O-Ring 6540-263

Part #: 6540-263

$0.22
In stock — ships today
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Fits these systems

Sundance SpasJacuzziPiranhaTheramax

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

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

Before you buy — quick checklist

  • Confirm your pump housing plug is 7/16" ID x 11/16" OD — measure your existing O-ring or groove before ordering
  • Inspect the O-ring groove for damage, corrosion, or debris that could prevent the new ring from seating properly
  • Verify your pump model is a compatible Sundance, Jacuzzi, Piranha, or Theramax system
  • Have silicone-based lubricant on hand before installation — never use petroleum-based grease on rubber O-rings

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

Exact part number

6540-263

Save this for ordering or warranty claims

Common symptoms this part fixes

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

  • Slow drip or steady leak from pump housing plug
  • Water pooling under pump wet end
  • Visible seepage around drain or access plug
  • O-ring flattened, cracked, or extruded out of groove

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

About this seal/gasket

This 7/16" ID x 11/16" OD O-Ring (part #6540-263) is an OEM replacement seal designed for Sundance Spas pump housing plugs. This precision-molded rubber O-ring creates a watertight seal in your pump assembly, preventing leaks that can damage your spa's motor and surrounding components. The exact 7/16-inch inner diameter and 11/16-inch outer diameter specifications ensure proper compression and sealing performance in compatible Jacuzzi, Piranha, and Theramax pump systems.

As an authentic OEM part, this O-ring delivers the exact fit guaranteed by Bubbles Supply, backed by our comprehensive 1-year warranty and same-day shipping commitment. Quality rubber construction resists chlorine degradation and temperature extremes for reliable long-term performance. Always inspect the O-ring groove for debris and apply a thin layer of silicone lubricant before installation to ensure proper sealing and prevent premature wear.

Install difficulty: Easy — DIY-friendlyTypically 5-15 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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