Replace a Leaking Moen 1225/1222 Shower Cartridge
Dripping tub spouts and stiff single-handle shower faucets in rental units are almost always worn internal O-rings on Moen brass (1225) or Positemp (1222) cartridges.
Tools & Materials Needed
- Moen Cartridge Puller tool
- Replacement cartridge (OEM Moen 1225 or 1222)
- White vinegar (for dissolving mineral scale)
- Plumber’s silicone grease
- Phillips screwdriver and adjustable wrench
Procedure
- Shut off the main water supply and relieve line pressure.
- Remove handle cap, screw, and decorative escutcheon plate.
- Pull the brass retaining clip straight up using needle-nose pliers (do not drop it behind the wall).
- Thread the cartridge puller onto the stem, twist to break mineral adhesion, and draw the cartridge straight out.
- Flush debris, lubricate the new O-rings with silicone grease, reinsert until flush, reinstall the retaining clip, and restore water.