Automatically controls line pressure and compensates for variations in inlet pressure. If there is a pressure surge, the regulator will close down, lowering the flow and pressure; if the flow is reduced because of a drop in the system pressure, the regulator will open to allow more flow. FKM o-rings. Threaded. Operation between 5 - 75 PSI, max inlet PSI of 150. CPVC available, contact us for a quote.