instead of copper pipe, middle is steel, outside is plastic. 1.large pressure, 2. ... degree 3.easy repair instead of seamless, copper pipePipe Outer diameter (mm)Pipe Thickness (mm)Pipe Working pressure (MPa) [hot and cold water ... gas, and combustion gas;Agriculture:Deep well pipe, Strainer, under drain conveying pipe, drainage pipe, irrigation pipe;Chemical industry:Manufacturing of Acid, alkali and ...