American Standard anti-scald, pressure-balancing Bath/Shower Temperature Control Valves accommodate seven styles of TRIMendous interchangeable bath/shower trim kits, including: Berwick, Colony, Dazzle, Hampton, Serin, Town Square and Tropic (all sold separately). Product Features Include: Cast brass valve body: Durable - quality that will last a lifetime, ideal material for prolonged contact with water; Ceramic disc valve cartridge assures a lifetime of drip-free performance, allows easy fine tuning of temperature (125 deg handle rotation from off to hot); Pressure balancing valve cartridge: Maintains constant output temperature in response to changes in hot and cold supply pressure, diaphragm system engineered to eliminate cross flow, avoids failure due to mineral deposits - ideal for use in hard water; Back-to-Back capability: Hot and cold can be reversed quickly and easily; Adjustable hot limit safety stop limits the amount of hot water allowed to mix with cold, reduces risk of accidental scalding; Plaster guard is designed to protect valve during installation and serve as a mounting plate for thin-wall installations, 2-piece design allows valve to be tested prior to trim installation