AUTO DRAIN 1/2" Particulate Filter & Pressure Regulator / Water Trap Compressed Air Line Coalescing Filter and desiccant dryer combo. Three Stage unit has added water separator pre filter to remove larger debris and moisture 1/2" FEMALE NPT INLET X 1/2" FEMALE NPT OUTLET Quick Release bowls and metal guards for easy maintenence and protection. Wall mounting bracket included. Replacement elements can be found in our ebay store. 150 Max pressure Particulate Filter & Pressure regulator combination: .05 micron filter will grab 95% of the large debris and moisture from your airline 150 PSI max pressure 7 PSI minimum Polycarbonate Bowl allows you to view moisture levels at a glance Regulator adjusts from 7 thru 150 PSI Gauge include 0-160 PSI Coalescing Filter: 0.01 Micron filter removes 99.998% of remaining debris and moisture left from the particulate filter. Having a particulate at the beginning of your airline extends the life of your coalescing filter. Red indicator Rises when filter element needs to be replaced Polycarbonate Bowl Desiccant Air Dryer: Comes with 2 bags of desiccant beads Beads turn Pink once they're ready to be changed.