How to Replace a Moen 1222 Cartridge: A Detailed Guide

If you have a Moen shower faucet that leaks or drips, you may need to replace the cartridge inside the valve body. The cartridge is a part that controls the water flow and temperature by balancing the pressure of hot and cold water. The Moen 1222 cartridge is compatible with Posi-Temp shower valves, which are designed to maintain a constant water temperature while showering.

Replacing a Moen 1222 cartridge is not very difficult, but it requires some tools and steps that you should follow carefully. Here is a step-by-step guide on how to replace a Moen 1222 cartridge and fix your leaky shower faucet.

Step 1: Turn Off the Water Supply and Drain the Faucet

Before you start working on your faucet, you need to turn off the water supply to prevent any accidents or damage. Locate the shut-off valves for the hot and cold water lines under the sink or behind the shower wall. Turn them clockwise until they are fully closed.

Then, turn on the faucet and let any remaining water drain out. This will relieve the pressure in the pipes and make it easier to remove the cartridge.

Step 2: Remove the Handle and Trim Pieces

Next, you need to remove the handle and any other trim pieces that cover the valve body. Depending on your faucet model, you may need to use a hex or Allen wrench, a Phillips screwdriver, or a flathead screwdriver to loosen and remove the screws or set screws that hold them in place.

Once you have removed the screws, pull off the handle and any other trim pieces, such as the escutcheon plate or temperature limit stop. You may need to use some force or wiggle them gently to loosen them. Keep all the parts and screws in a safe place for reassembly later.

Step 3: Remove the Retainer Clip

Now, you need to remove the retainer clip that holds the cartridge in place inside the valve body. The retainer clip is a small metal piece that slides into a slot on top of the valve body. You can use needle nose pliers to grab the top of the clip and pull it out carefully. Be careful not to drop the clip behind the wall or lose it.

If you cannot access the retainer clip because of the escutcheon plate, you may need to remove it first by using a Phillips screwdriver to unthread the screws that hold it in place.

Step 4: Remove the Cartridge

Next, you need to remove the old cartridge from the valve body. The replacement cartridge should come with a white plastic nut-like tool that fits over the stem of the cartridge. Slip this tool over the stem and into the cartridge to secure it.

Then, using pliers, move it back and forth to separate the cartridge from the valve body. Loosen the nut, grab the cartridge’s stem with pliers and yank it directly out of the valve body. This may require some effort.

Note: It is highly recommended to clean and flush the valve body before installing the new cartridge. You can use a soft cloth or a brush to remove any debris or mineral deposits from the valve body.

You can also turn on the water supply briefly to flush out any dirt or particles from the pipes. Make sure to cover the valve opening with a rag or a cup to prevent water from spraying everywhere.

Step 5: Install the New Cartridge

Now, you are ready to install the new cartridge into the valve body. First, lubricate the rubber grommets on the sides of the cartridge that face outwards. These grommets help seal the cartridge and prevent leaks. You can use some plumber’s grease or petroleum jelly to lubricate them.

Then, slide the new cartridge into the valve body, making sure the H and C tab on the top of the cartridge is pointing up and flush with the valve body.

Do not rotate the cartridge as you insert it. The rubber grommets are not permanently affixed and may fall off if you twist them. Make sure they are aligned with the slots on the valve body.

Step 6: Reinsert the Retainer Clip

Next, you need to reinsert the retainer clip that secures the cartridge in place. Gently slide the clip back through the slot on the brass valve body. If you encounter any resistance, make sure the cartridge is flush with the valve body and aligned properly.

If the retainer clip cannot be installed for any reason or it appears to be damaged or broken, do not turn on the water supply until you replace it. The retainer clip is essential for preventing leaks and keeping the cartridge in place.

Step 7: Reassemble the Handle and Trim Pieces

Finally, you need to reassemble the handle and trim pieces that you removed earlier. Follow the reverse order of how you took them apart and use the same tools and screws that you used before. Make sure everything is tight and secure.

Step 8: Turn On the Water Supply and Test the Faucet

Now, you are done with replacing your Moen 1222 cartridge. Turn on the water supply and test your faucet for leaks and proper operation. You may need to adjust the temperature limit stop or the handle position if needed.

Congratulations! You have successfully replaced your Moen 1222 cartridge and fixed your leaky shower faucet. Enjoy your shower and save water and money.

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