Employ solid piston and balanced poppet for long lasting performance. Solid piston is impervious to most chemicals and a wide range of lubricating oils and greases. Resists rupture, cracking or tearing under pressure, constant flexing or high cycle rates . Provides accurate control, and assures smooth, uninterrupted operation. Fast reverse flow capability allows for installation where dual pressures are required. Two gauge ports are provided and a pressure gauge is included. 250 PSI max primary operating pressure and 2 to 125 PSI max secondary operating pressure. 13 SCFM, 2.9" overall height.