3-Stage Desiccant Air Dryer System to Eliminate Moisture and Dirt in Air Lines (130026)DeVilbiss DAD 500 Desiccant Air Dryer System Three stage drying and filtering system. This Air Filter, Oil Coalescer, and Dryer will eliminate costly redo's due to moisture and dirt in the air line. Features and Benefits: The first stage centrifugal filter removes oil, water, and dirt down to 5 microns. The second stage coalescer filter removes oil aerosols and dirt particles down to . 01 microns. The third stage uses low dusting desiccant to trap