Cash Acme 20166-0030 F-30 Asme 3/4-Inch Pressure Relief Valve Set At 30 Psi Pop type action provides maximum safety Designed for use on hot water heating boilers, water supply boilers and storage tanks Used in saturated water applications, but NOT TO BE USED in steam applications The F-30 and F-82 are capacity certified to ASME Boiler Code Section IV