Contractor series compressors feature heavy duty oil lubricated with cast iron sleeve pumps. They feature two piece connecting rods, an independent wrist pin and a real 3 ring piston. All contractor series compressors have fan cooled, thermal overload protected motors and a heavy duty pressure switch with on/off control and copper bleeder tube. A finned copper discharge tube is used to increase heat dissipation. All units come with a regulator (except gas units which are regulated by a pilot valve) and easy to read pressure gauge.