Cash Acme F-82 Series pressure relief valve with 3/4" 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 30 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.