How To Replace A Moen Single Handle Bathroom Faucet Cartridge

Replacing the cartridge in a Moen single handle bathroom faucet is a relatively simple task that can be completed in about 30 minutes. Here is a step-by-step guide on how to do it:

Materials needed:

New Moen 1225 cartridge
Adjustable wrench
Allen wrench (if applicable)
Phillips screwdriver

Step 1: Turn off the water supply

Locate the water supply valves under the sink and turn them off. Open the faucet to release any remaining water in the lines.

Step 2: Remove the handle

Use an adjustable wrench to loosen the nut securing the handle to the faucet body. Pull the handle straight up to remove it.

Step 3: Remove the cap

Use a Phillips screwdriver to remove the cap located underneath the handle.

Step 4: Remove the cartridge

Use an adjustable wrench to loosen the nut holding the cartridge in place. Pull the cartridge straight out of the faucet body.

Step 5: Install the new cartridge

Insert the new cartridge into the faucet body and tighten the nut by hand. Use the adjustable wrench to further tighten the nut.

Step 6: Reinstall the cap

Place the cap back over the cartridge and tighten it with the Phillips screwdriver.

Step 7: Reinstall the handle

Push the handle back onto the faucet body and tighten the nut with the adjustable wrench.

Step 8: Turn on the water supply

Turn on the water supply valves under the sink and check for leaks. If there are no leaks, then the cartridge replacement is complete.

Tips:

If the cartridge is stuck, you can use a pair of pliers to gently pry it out.
Be careful not to overtighten the nuts, as this can damage the faucet.
If you are replacing the cartridge due to a leak, be sure to inspect the O-rings on the cartridge and replace them if necessary.