Pressure relief valve, FP53L, UL Listed 1⁄2" NPTFemale Output, 1⁄2" NPT Male Outlet Watts No. FP53L is designed for use in fire protection grid systems to provide protection against excessive water pressure caused by thermal expansion or line surge. It has a standard 175 psi pressure relief setting and can be installed horizontally or vertically. Bronze body construction with stainless steel spring to inhibit corrosion. The valve is constructed with a precision stem guide to ensure proper reseating. The test lever affords periodic manual testing and flushing of waterways and seating surfaces. FEATURES 2 Underwriters Laboratory listed 2 Forged stainless steel spring 2 Bronze body construction for superior strength and to prevent corrosion 2 Manual test lever 2 Valve stem is guided to enhance reseating 2 1⁄2" male inlet x female outlet 2 175 psi pressure setting