Corrugated Pipes, Waterstops, Expansion Joints manufacturer / supplier in China, offering Spiral Corrugated Metal Pipe DN500-3000mm for Agricultural Drainage, 2mm Thickness Galvanized Steel Culvert Pipe, 1m-6m Diameter, Custom Length, Corrugated Steel Pipe with 275G/M² Zinc Coating, Anti-Corrosion and so on.