Employs solid piston and balanced poppet for long lasting performance. Solid piston is impervious to most chemicals anda wide range of lubricating oils and greases. Fast reverse flow capability allows for installation where dual pressuresare required. Two gauge ports are provided and a pressure gauge is included. 250 PSI max primary operating pressure and2 to 125 PSI max secondary operating pressure. 13 SCFM, 2.9" overall height.