DEWALT's 30 Gal. Air Compressor features a cast iron, twin-cylinder, oil-lubricated pump. This includes a 1-piece cast iron crankcase, thermally stable cast iron cylinder body, aluminum head and valve plate, automotive style ball bearings, durable Swedish stainless steel reed valves, oil level sight glass, easily accessible oil fill and a 12 inch cast iron balanced flywheel. The unit has a heavy-duty induction motor for maximum performance and efficiency. This dual voltage motor is wired for a standard 120-volt outlet and can also be converted for 240-volt applications.