PE/PVC Double-wall corrugated pipe extrusion line(corrugated pipe line,PE pipe line,PVC pipe line) PE/PVC Double-wall corrugated pipe extrusion line (corrugated pipe line,PE pipe line, PVC pipe line)The Double-wall corrugated pipe has advantages of light weight, easy ... duct,cabling protection, etc. PE/PVC Double-wall corrugated pipe extrusion line(corrugated pipe line,PE pipe line,PVC pipe line)