Oil lubricated pump with cast iron cylinders provides over 1500 running life hours. 4.0 SCFM delivered @ 90 PSI pump, 4.0 gallon tank and 125 max PSI enables more nails to be fired and provides quicker recovery. Dual soft start valves assist in cold weather start up. Site glass for easy check of oil level 4 gallon twin stack tank design with proven acceptance in the market. Ball drain valve for quick and thorough tank draining. Universal push-to-connect coupler for ease of operation. Utilizes EMGLO®'s 50 years of expertise in air compressors.