R121SS - 1/2" Pressure Balance Rough-In Valve - Universal Inlets / Outlets - Screwdriver StopsAmerican Standard R121SS 1 2" Pressure Balance Rough In Valve Universal Inlets Outlets Screwdriver Stops These anti scald, pressure balancing Bath Shower Temperature Control Valves accommodate seven styles of TRIMendous interchangeable bath shower trim kits, including: Berwick, Colony, Hampton, Serin, Town Square, Fluent, Times Square and Tropic (all sold separately). Features Cast Brass Valve Body: Durable Quality that will last a lifetime. Ideal