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In this video, This Old House plumbing and heating expert Richard Trethewey changes a shower valve.

How to Replace Single Handle Shower Faucet

  1. Turn off the water to the shower.
  2. Remove handle and escutcheon plate to expose shower valve.
  3. Loosen locking nut with pliers and pull old cartridge from center of valve.
  4. Put new rubber seat with spring onto end of pencil and push into the valve. Repeat for remaining seat.
  5. Insert the new cartridge into the existing valve.
  6. Slip the O-ring over the cartridge, then tighten the locknut with pliers.
  7. Press the new escutcheon plate over the valve and secure it with the screws provided.
  8. Attach the new handle to the valve.
  9. Turn on the water and adjust the temperature to 120 degrees F.
  10. Install the temperature limit stop to the valve to prevent scalding.

Read More: How to Repair a Shower Valve Stem; How to Repair a Shower Valve in a Tile Wall