The Watts F259705 1" 140X-6 150/210 FS is an automatic reseating temperature and pressure relief valve designed to protect commercial hot water supply tanks and water heaters. It uses a 6-inch stainless-steel thermostat to sense excessive temperature and opens at 210°F, while the pressure relief function activates at 150 PSI to discharge excess pressure. Its durable bronze body, 1-inc... https://www.partshnc.com/watts-f259705-1-pressure-relief-valve-150-210-psi-fs-140x-6