Profile: Watts introduced the revolutionary combination temperature and pressure (T&P) relief valve, a protection device for use on hot water supply tank systems. Watts Regulator Company focuses on valve technology. We manufacture pressure reducing valves to regulate steam and relief valves to ensure safe operation of water heaters and boilers. These T&P valves prevent dangerous hot water heater explosions and continue to be an integral part of today's water heating systems. We are instrumental in the promotion of backflow prevention devices to prevent the backward flow of contaminated water from entering into the potable water supply.