How to Replace a Bathtub Faucet Cartridge

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Whether your bathtub faucet continues a slow drip after being shut off or you find that the water temperature must repeatedly be reset to maintain the desired temperature, the most common cause of these and many other minor faucet problems is a faulty cartridge. Replacing the cartridge is a simple repair you can do yourself and restore the proper functioning of the bathtub faucet.

Things You'll Need

  • Utility knife
  • Screwdriver
  • Snap ring pliers
  • Cartridge extraction tool
  • Replacement cartridge
  • Shut off the home's main water valve to stop the water supply to the bathtub faucet.

  • Remove the control handle from the faucet control arm by first removing the retainer screw cap at the center of the handle with the blade tip of a utility knife. Use a screwdriver to loosen and remove the handle retainer screw.

  • Remove the cartridge retainer ring with snap ring pliers and set aside for reuse.

  • Slide the cartridge extraction tool over the faucet post and attach the end of the control arm with the extraction tool's end screw. Slowly turn the extraction tool counterclockwise to extract the faucet cartridge from the faucet housing.

  • Install the rubber gasket rings provided with the new cartridge by stretching them into the top and bottom gasket notches. Do not attempt to use the gaskets from the old cartridge.

  • Thread the new cartridge into the faucet housing, rotating it clockwise until fully seated into the housing.

  • Reinstall the cartridge retainer ring into the cartridge notch with snap ring pliers.

  • Replace the faucet control handle removed in Step 2. Then snap the handle screw cap into place.

  • Restore the water supply to the bathtub faucet by turning the home's main water valve on.

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