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Pump Seal PS-3865R - Bubbles Supply

Pump Seal PS-3865R

Part #: PS-3865R

$11.38
In stock — ships today
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this seal/gasket

The US Seal PS-3865R is a premium Viton pump seal engineered for salt water and ozone sanitizer systems in hot tubs and spas. This specialized seal features a 5/8" shaft diameter and 1.437" seal outer diameter, designed to withstand the harsh chemical environment of modern spa sanitization systems where standard seals would quickly deteriorate.

Built with Viton material for superior chemical resistance, this OEM-quality seal provides reliable protection against leaks in pumps exposed to salt water generators and ozone systems. At Bubbles Supply, we guarantee an exact fit for your pump application and offer same-day shipping with our comprehensive 1-year warranty for complete peace of mind. Verify your existing seal's shaft and outer diameter measurements before ordering to ensure proper fitment and optimal performance.

Exact part number

PS-3865R

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • ozone system pump seal
  • PS3865R
  • pump shaft seal
  • salt water pump seal
  • Viton mechanical seal

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:

  • Wet spot or puddle under pump housing
  • Water dripping from pump shaft area
  • Seal face scoring or discoloration from chemical exposure
  • Premature seal failure on salt or ozone system
  • Mineral or salt crust buildup around pump shaft

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

Before you buy — quick checklist

  • Measure your existing seal's shaft diameter — must be 5/8" for this seal to fit
  • Measure the seal outer diameter — must be 1.437" for correct seating
  • Confirm your system runs a salt water generator or ozone sanitizer, as this Viton seal is chemically rated for those environments
  • Do not order based on pump brand alone — shaft and OD measurements are the only reliable way to confirm fitment
  • Inspect the seal seat (ceramic or carbon mating surface) while the pump is open — replace the seat if scored or cracked

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

Install difficulty: Medium — Some experience neededTypically 45–90 minutes

Warranty

1 year 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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