How to Replace a Tub Overflow Gasket

half-filled tub with view of faucet and overflow gasket

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The tub overflow gasket sits behind the overflow plate and provides a seal around the overflow pipe of a bathtub. Like other rubber gaskets, the overflow gasket can dry out over time. An old and dry gasket becomes so compressed that it can no longer maintain a watertight seal. If you are experiencing leaks when the tub is full of water it may be due to an overflow drain leak meaning that it is time to replace the tub’s overflow gasket.

Replacement overflow gaskets can be purchased at a hardware store or local home improvement store.

Difficulty: Easy

Time required: 15 minutes


Watch Now: How to Replace a Tub Overflow Gasket


  1. Use a utility knife or scraping tool to remove any existing caulking from around the edge of the overflow cover plate.
  2. Remove the overflow cover plate with a screwdriver.
  3. Locate the old overflow gasket. If it is fairly intact, remove with your fingers or a pair of pliers. If the gasket is too compressed, you can scrape it off with a screwdriver or scraping tool. It is OK if bits of the old gasket fall behind the tub as you are scraping it off.
  4. Install the new overflow gasket by centering it in the overflow opening. Sometimes it is necessary to gently push back on the overflow pipe to get the gasket into position.
  5. Screw the overflow trim plate back into position tightly enough to feel the gasket squeeze into position.
  6. Finish by caulking around the top half of the overflow plate to help prevent future leaks and keep the trim looking nice.