... double wall corrugated composite pipe 1.DN:200-800mm 2.Ring stiffness:SN4 and SN8 ... pipe toughness good.HDPE double wall corrugated pipe, high crushing bear. Responsibility for the performance of ... good sealing performance, corrosion resistance, shake resistance, good quality, cheap, easy to install and use the advantage. ... and drying crackConformedCreep rate,%≤20.46% High quality HDPE corrugated pipe