How to Replace a Sink Drain Gasket

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The sink drain gasket helps keep the drain from leaking. Made of durable rubber and rarely subjected to pressure, the gasket rarely goes bad or needs replacing. However, should you need to replace a missing, faulty or deteriorated gasket, the process is simple, no more difficult than replacing a light bulb. In fact, the most difficult part of the entire job is kneeling to get under the sink.

Things You'll Need

  • Pliers
  • Basket strainer wrench
  • Hammer
  • Putty knife
  • Plumber's putty
  • Clear the area underneath the sink.

  • Loosen the slip nuts connecting the tailpiece (pipe section connecting the strainer and drain pipe) with the pliers, and remove the tailpiece by hand.

  • Remove the lock nut at the bottom of the drain, using the pliers, and unscrew the drain locking ring with the basket strainer wrench. Tap the wrench with the hammer if the locking ring will not move. Set them both aside, then push the sink strainer assembly up into the sink.

  • Remove the drain seal and drain gasket from the drain unit by hand. Scrape any old plumber's putty from the unit, using the putty knife. Slide the new gasket and the drain seal onto the unit by hand.

  • Apply a bead of plumber's putty to the underside of the drain unit before reinserting it in the sink.

  • Reattach the drain locking ring, followed by the drain lock nut. Reattach the tailpiece, reconnect it to the drain pipe and tighten the slip nuts by hand. Give a final half turn with the pliers. Do not overtighten.

  • Run the water to test for leaks.

References

  • "Plumbing 1-2-3;" The Home Depot; 2001
  • Photo Credit money down the drain 2 image by Robert Young from Fotolia.com
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