Trim kit includes: Metal handle, escutcheon plate, one-piece cartridge. Rough-in valve is sold separately. 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