The California Air Tools 20040C Ultra Quiet & Oil-Free Air Compressor is designed to be one of the quietest 4.0 Hp air compressors in the industry producing only 75 decibels of sound. The Powerful (2) 2.0 HP (SP-9421-22060) motors operates at only 1680 RPM creating less noise and less wear. The "New" SP Series of Ultra Quiet Air Compressor Motors have been designed to increase duty cycle and allow for longer continuous run times. The Oil-Free Dual Piston Pump System is engineered for high performance and durability. The CAT-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 Oil-Free pump allows for use in a variety of temperatures (cold starts) and uneven terrains (no oil in the pump). The large 20 gal. Steel Air Tank is just the right size for shop or garage. Designed for the person looking for Power, Air Flow and Less Service with at Least 30% Less Noise!Limited Warranty 1 Year