How to Replace the Gasket in a Bathroom Sink


The sink gasket works silently underneath your sink, making sure that you don't wind up with a bathroom floor full of water. The visible part of the drain in the sink, called the flange, is connected underneath to a straight piece of plumbing called the tailpiece. At the top of the tailpiece, just beneath the drain, sits the gasket, which is held in place by a large nut called the jamb nut. If you notice that your bathroom sink is leaking from around the drain, try replacing the gasket before you call the plumber.

Things You'll Need

  • Pliers
  • Bucket or other container
  • Penetrating lubricant
  • Plumber's tape
  • Turn off the water. This is usually located on the wall beneath the sink. This will help prevent anyone from accidentally turning it on while you are working. Twist the knob counterclockwise to shut off the water supply.

  • Place a bucket or other suitable container underneath the P-trap. Loosen the couplings on the P-trap with the pliers. Pull the P-trap out from the other pipes. Be careful, as it will be full of stagnant water. Turn the P-trap over above the bucket and empty out the water. Set the P-trap and bucket aside.

  • Loosen the jamb nut located just beneath the drain with the pliers. If it is stuck tight, sprinkle a few drops of penetrating lubricant on the nut and allow it to sit for a few minutes. Remove the jamb nut.

  • Pull off the rubber gasket sitting just beneath the drain. If it is rotted, you may have to scrape parts of it away with a putty knife.

  • Clean off the bottom of the drain. Remove any debris, mildew or mold buildup. Let this dry.

  • Slide the new gasket up the tail piece until it is flush with the bottom of the sink.

  • Slip the jamb nut up over the tail piece and slide it up next to the gasket. Tighten with the pliers.

  • Clean the threads on the sewer inlet pipe and the tailpiece. Wrap them with plumber's tape. Insert the P-trap back into place. Tighten the couplings.

  • Turn back on the water. Run the faucet. Check for leaks. Tighten the jamb nut or couplings if necessary.

Tips & Warnings

  • For an extra watertight fit, you can apply a thin bead of silicone caulk around the perimeter of the gasket before you slide it in place next to the drain.

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  • Photo Credit modern sink image by nextrecord from
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