The Industrial Air products are designed exclusively for the heavy duty needs of the mechanic shop, livestock operation and service truck. Featuring extra heavy duty components, these air compressors are built to last under the toughest, most demanding conditions. Twin cylinder cast iron pump features a one-piece cast iron crankcase, thermally stable cast iron cylinder body, aluminum head & valve plate, automotive style ball bearings, durable Swedish stainless steel reed valves, oil level sight glass, easily accessible oil fill, and 12 in cast iron balanced flywheel. Shipped with synthetic oil for optimum performance and long life. This portable model also features pneumatic tires for increased portability.