Profile: Castair, Inc. manufactures air compressors. Our product includes industrial air compressors, contractor air compressors, rotary screw air compressors and air compressor pumps. We design an oil lubricated belt drive air compressor, which includes heavy-duty cast iron pump and heavy-duty bleeder pressure switch with an on/off control and a copper bleeder tube. Our air compressor pump features tapered roller bearings at both ends of crankshaft and connecting rods.