The Bradford White 415-33630-04 Temperature and Pressure Relief Valve is a safety component designed for high-capacity water heaters and compatible heating systems. Featuring a 1-inch connection and a 150 PSI pressure rating, it automatically releases excess pressure or hot water when internal temperature or pressure exceeds safe limits, including a temperature threshold of 210°F. https://www.partshnc.com/415-33630-04-bradford-white-temperature-pressure-relief-valve-1-150