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.