The California Air Tools 60040DCADC Ultra Quiet, Ultra dry oil-free air compressor with air drying system is designed to be 1 of the quietest 4.0 HP air compressors in the industry having only 75 db of sound. The powerful two 2.0 HP motors operates at only 1680 RPM creating less noise and less wear. The cat-60040dcadc air compressor has a oil-free dual Piston Pump designed to have a life cycle before wear of 3000 plus hours compared to other comparable air compressors with life cycles of 1500-hours or less. The large 60 GAL. Steel Air tank is just the right size for shop or garage. The air Dryer is specially designed to remove up to 98% of the water vapor from the air to protect sensitive tools and machinery. Pdp performance range (-20°f to -51°f). air quality: ISO 8573-class 2.3.1. To dry The air from the air compressor an aftercooler and dryer are utilized. The aftercooler is a heat exchanger for cooling the discharge air from the air compressor. The water vapor from the compressed air is condensed into liquid form and pushed into the air Dryer. The easy to replace spin-on air Dryer cartridge has a regenerating high-temperature molecular sieve desiccant to dry The air. This cartridge Dryer has a life of 2-years before replacement. The California Air Tools EZ-1 automatic drain valve Has been designed to eliminate manually draining your air compressor air tank. Designed for the person looking for power, Dry air and air flow with at least 30% less noise. Includes two (2) 0.01 Micron Prefilters. This Ultra Quiet & Oil-Free Air Compressor with built-in Air Drying System is designed for industries including Dental Office, Dental Milling, Dental Lab, Medical, Biotech, Laser, Restaurant, Manufacturing, CNC, 3D Printing and other specialized pneumatic systems with a need for Clean Dry Air.