Includes One Piece Cartridge: Simplifies installation and maintenance Double Ceramic Pressure Balance Cartridge: Combination of Ceramic Disc Mixing Valve and a Ceramic Balancing Spool in a one piece cartridge Ceramic Disc Mixing Valve: Assures a lifetime of drip-free performance and smooth handle operation Ceramic Balancing Spool: Maintains a constant output temperature in response to changes in relative hot and cold supply pressure; Ceramic material is unaffected by mineral deposits and harsh water conditions Integrated Check Valves: Engineered to eliminate cross flow