12 PSI Medium Flow Pressure Regulator 1" FNPT

12 PSI Medium Flow Pressure Regulator - with 1" FNPT Inlet/Outlet For Use with Sumisansui Mark II and Mark 3 tubes Medium Flow Pressure Regulator is for mid-range flows of 2–20 GPM Perfect for M Series Sumisansui, drip, and other low volume irrigation The pressure regulator shall maintain the predetermined operating pressure provided the inlet pressure is at least 5 PSI above the expected outlet pressure, but must not exceed the maximum inlet pressure rating. Always install pressure regulators downstream from all shut-off valves. Be sure to install pressure regulators in the proper direction. The arrow on the housing shows the direction of the flow and should always point downstream toward emitters.