... :SN4,SN8 HDPE double wall corrugated pipeHDPE density polyethylene double wall corrugated pipe is a new type of light-weighed ... saving irrigation, wastewater processing industry,etc.and is the best substitute of traditional concrete pipes, cast iron pipes and ... ,anticorrosion, no leakage, no scaling, no secondary pollution, the ideal environment-friendly pipes.l Good flexibility and adjustability to ...