Experience optimal temperature control in the shower with our American Standard Tub & Shower Pressure Balancing Unit. Its diaphragm system and integrated check valves are designed to eliminate cross flow and keep water temperature constant, regardless of changes in hot and cold water pressure. The long-lasting design also resists mineral deposits, so it's perfect for hard water areas. Enjoy a safe showering experience free from scalding with this Pressure Balance Unit, which is compatible with our R110, R120, R115, and R125 rough in valves.