Offering superior operation, the 20 Gallon Horizontal Portable Air Compressor from Porter-Cable features a heavy-duty induction motor for maximum efficiency. It boasts a cast iron, V-twin cylinder, oil-lubricated pump with 1-piece cast iron crankcase and thermally stable cast iron cylinder. Automotive-style ball bearings, durable stainless steel reed valves, easily accessible oil fill and 10 in. cast iron balanced fly wheels provide exceptional performance so you can get the job done. Pneumatic tires give this portable tank easy transport to multiple job sites.