Material: The 3/4 inch NPT 4 stage air drying system is made of aluminum material, which is strong and wear resistant to ensure long term performance and reliabilityAccurate Pressure Regulation: Coalescing Filter, high reliability and performance, adopt press in self locking pressure regulation, use 1.6 Mpa pressure, accurate and stable pressure regulationStage 1 Regulator/Filter: Particulate filter are equipped with 5 microns elements, have good filtering performance, are reusable, have a long service life, and can effectively remove most of the moisture and particles in the air pipeStage 2 Coalescing Filter: Coalescing filter are equipped with 0.01 microns elements, which can remove most smaller particles, moisture, etc. that pass through the first stage combination. When the filter elements needs to be replaced, the red indicator light will light upStage 3 and 4 Desiccant Air Dryer: The desiccant air dryer can dry and clean the air before entering the pneumatic tool. You need to add desiccant beads to the metal bowl. When it's time to replace the desiccant, the beads will change from blue to pink Specification: Material: Aluminum Size Chart: Packing size 37 cmx37 cmx15 cm/14.57 inchx14.57 inchx5.91 inch Package Includes: 1x 4 Stage Air Drying System1x Dial Gauge for the 1/4 inch1x Connector2x 3/4 inchx3/4 inch Male Pipe1x 5 Microns Elements and 0.01 Microns Elements8x Desiccant Beads Bag1x Tape Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.