The California Air Tools 10010DCAD Ultra Quiet and Oil-Free Air Compressor are designed to be one of the quietest 1 HP air compressors in the industry having only 60 dB of sound. The powerful 1 HP motor operates at only 1680 RPM creating less noise, vibration and creating less wear. The Oil-Free Dual Piston Pump System is engineered for longevity, high performance and durability. The SP-9413 Motor/Pump is tested for a minimum pump life of 3000 hours before service, 25% more life before repair. The large 10 Gal. steel air tank is only 75 lbs. The Air Dryer is specially designed to remove the water vapor from the air to protect sensitive tools and machinery. To dry the air from the air compressor an after cooler and dryer are utilized. The after cooler 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 California Air Tools EZ-1 Automatic Drain Valve has been designed to eliminate manually draining your air compressor air tank. The manually set timer allows you to set the time for both the frequency and duration of the draining process. This air compressor is ideal for anyone working inside (office, shop, store, warehouse. lab or home) where noise is a major issue.