The R-K NPR series pilot operated (remote) pressure regulator is ideal for hard to reach places and for situations where instant fluid pressure changes are needed (such as spraying or rinsing applications). When the valve is installed the pressure can be adjusted from 5-100 P.S.I. with an air pressure regulator to protect the system from pressure changes. It will provide accurate outlet flow if a series of pressure regulators are required for a system or operation. Wide working pressure range (5 to 100 PSIG) Top entry for easy in-line maintenance and a minimum water hammer. Air-to-open, spring to close. Molded bodies are standard for 1/2", 3/4"", and 1"" valves