AVAPRF250 Dixon Cast Brass Domestic Adjustable Pressure Restricting Angle Valve - 2-1/2" Female NPT Inlet x 2-1/2" Female NPT OutletFeatures: Preset orifices restrict the volume of water thereby lowering the pressure of the flowing water; NFPA requires restricting valves where inlet pressure exceeds 100 PSI. Restricting valve has no effect on the static pressure of a system. Can be manually by passed if required by opening the valve fully, this is accomplished by breaking the breakable link, which allows the valve stem to rise to the full open position. Breakable link also serves