Brass. Replaces Moen part number / model number 1200/1225. 

• Brass outer housing with a stainless steel shaft that diverts water and extends the life of the cartridge and valve body.
• Quadruple seal gasket that seals the eroded areas of the valve body.
• Improved shower performance increases water conservation.
• Complete elimination of unwanted mixing of hot and cold water.
• Elimination of dripping seats and the need for valve seat replacement.