Description Stage 1 - 5 Micron Particulate Filter Stage 2 - .01 Micron Oil Removing Filter Stage 3 - 1-Gallon Desiccant Dryer, Metal Bowl w/Sight Glass Stage 4 - 3 Micron Absolute Filter (controls desiccant dust) Stage 5 - Precision Regulator w/Gauge 30 SCFM Flow Unit includes Desiccant Charge, Ball Valve and Mounting Brackets