Cash Acme F-82 Series pressure relief valve with 1" NPT female inlet and outlet connections. This valve is designed for use on hot water space heating boilers, water supply heaters, and storage tanks. It has a maximum pressure of 150 psi. F-82 safety relief valves are designed for use on hot water service only and are not to be used on steam. These high capacity pressure-only safety relief valves feature bronze bodies, silicone seat discs, EP diaphragms, brass internal parts, and stainless steel pressure springs.