Moen 1-Handle Brass and Plastic Tub/Shower Valve Cartridge in the Faucet Stems & Cartridges department at Lowes.com
Moen Cartridge Puller for 1200, 1222 and 1225 Single Handle Cartridges with One-Handle PosiTemp Faucet Cartridge Replacement for Moen Tub Shower - Amazon.com
Moen 1222 One-Handle Posi-Temp Faucet Cartridge Replacement for Moen Tub Shower and Shower Only Configurations, Brass and Plastic - Faucet Cartridges - Amazon.com