Step 4 · Extract the Old Cartridge
Your new Moen cartridge (model 1222) should come with a small plastic tool. Fit this tool over the stem of the old cartridge and use pliers to grip the tool, twisting it back and forth a quarter turn each way to break the cartridge's seal with the valve body. Once it feels loose, use the pliers to grip the metal stem of the cartridge and pull it straight out. If the cartridge is seized and will not come out, you must use a dedicated cartridge puller tool. This tool threads onto the cartridge stem and uses leverage to safely extract it without damaging the valve.