... alloy. 2.Heating ,air-conditioning technology, pneumatics,air compressor, vacuum pump, pressure air regulating, testing equipment, medical sterilizer,etcSpecial features ... or Steel , black Φ160 Steel, blackDesign for window:snap on plastic(for plastic case ), screw in polycarbonatesteel, steel black ... sold to the U.S.A., Canada, European and countries in South-East Asia; it is the large-scale pressure ...