Introduction of Pipe: HDPE Large Diameter Gas and Water Pipe that are produced by this line have excellent stiffness and flexibility, heat resistance, aging resistance, high mechanical strength, resistance of environmental stress cracks, resistance to creep deformation, heat-linkage, and so on. So, it is a preferred gas and water pipe for ductwork system between city and its suburb, Large diameter HDPE pipes start to play very important role in the city water and gas supply systems.