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. Adjustable Hot Limit Safety Stop: Limits the amount of hot water allowed to mix with cold. Reduces the risk of accidental scalding. Comfort Zone: Offers a wider shower range to fine tune the desired temperature within the useful temperature zone. Back-to-Back Capability: Hot and cold can be reversed quickly and easily.