The California Air Tools 4620AC 2 HP 4 Gallon Ultra Quiet Aluminum Twin Tank Air Compressor is designed to be one of the quietest 2.0 HP air compressors in the industry having only 70 decibels of sound. The Powerful motor operates at only 1,680 RPM creating less noise and less wear. The SP Series of Ultra Quiet air compressor motors have been designed to increase duty cycle and allow for longer continuous run times. The CAT-4620AC Air Compressor has an oil-free dual piston pump designed to have a life cycle before wear of 3,000 plus hours compared to other comparable air compressors with life cycles of 500 hours or less. The large 4.6 Gallon Aluminum Air Tank is ideal for the person looking for power, air flow, less service and maintenance with at least 30% less noise.