How to Replace Moen Posi-Temp Cartridge


Al Moen invented the cartridge faucet in the 1940s, and since then the company named after him, simply called Moen, him, has added several refinements to the original design. The Posi-Temp cartridge, unlike earlier ones, is designed to prevent scalding and will work only if it is installed in the correct orientation. The faucet has a scald-guard feature that allows a user to set the maximum temperature of the water the faucet will deliver.

Things You'll Need

  • Allen wrench
  • Phillips screwdriver
  • Needle-nose pliers
  • Turn off the water to the faucet, either by shutting off the house mains or by shutting off the water at the street.

  • Use an Allen wrench to remove the nut holding the handle onto the faucet stem, then remove the handle.

  • Using a Phillips screwdriver, unscrew the piece of black plastic attached to the faucet stem, and remove it. Slide out the the chrome sleeve that surrounds the cartridge. Note the orientation of the cartridge, as the new one will have to go back in the same orientation. The letters H and C should be at the top. If the hot and cold supply lines are reversed, they will be at the bottom.

  • Use needle-nose pliers to grip the brass pin holding the cartridge in place, and pull the pin straight up. Put the pin in a safe place, as a new pin will not be supplied with the replacement cartridge.

  • Reattach the black plastic piece to the faucet stem, and use it as a handle to pull the cartridge out.

  • Insert the new cartridge in the same orientation as the old one. Replace the pin, making sure it is fully seated. You shouldn't have to force the pin. If it doesn't go in smoothly, the cartridge probably is not fully seated.

  • Adjust the scald-guard feature according to the instructions that came with the cartridge. Replace the chrome sleeve, then screw the black plastic piece onto the faucet stem, and replace the handle.

Tips & Warnings

  • If the washers come off the cartridge, make sure you replace them on the correct sides. This should be easy, since each will fit only on one side.
  • Make sure the water is off before you pull the pin holding the cartridge in place. If you don't, the cartridge will shoot out in a spout of water, and you won't be able to replace it until the water is off.
  • Use caution: If you install the cartridge the wrong way, you could be scalded.

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