How to Replace a Shower Faucet Valve Seat


A worn out shower faucet valve seat will cause the shower to leak water uncontrollably, or make it difficult or impossible to shut the water off. At the first signs of a failing faucet valve seat, take the necessary steps to make the replacement, otherwise the problem will only worsen. If you have not recently replaced the wearable parts on the valve stem itself, you should take the opportunity to do that as well while the faucet is disassembled, since worn valve stem parts can cause the same problems.

Things You'll Need

  • Phillips screwdriver
  • Hair dryer
  • Handle puller
  • Bath socket
  • Valve seat wrench
  • Penetrating lubricant
  • Pipe dope
  • Replacement seat
  • Turn off all the water in the home's plumbing system by closing the main water valve. Turn on the shower faucet to make sure the water pressure has diminished completely before continuing.

  • Remove the plastic cap from the handle for the valve seat you wish to replace. Unscrew the retaining screw that was hidden by the cap.

  • Remove the handle from the valve assembly. If the handle does not come off easily, heat it for a few minutes with a hair dryer, or clamp a handle puller onto the handle and turn the center post clockwise to free the handle.

  • Insert a bath socket over the valve stem and twist the socket counterclockwise to back the valve stem out of the faucet assembly. Insert a seat wrench into the opening in the faucet assembly where the valve stem was, then turn the seat wrench counterclockwise to remove the seat as well

  • Squirt a penetrating lubricant onto the valve seat if it is stuck, wait five minutes, then remove the seat. Apply pipe dope to the new valve seat before installing it into the faucet, then reinstall the rest of the faucet in the reverse order you took it apart.

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