Corrugated Pipes, Waterstops, Expansion Joints manufacturer / supplier in China, offering Zinc-Aluminum Coated (Galfan) Culvert Pipe, 50 Years Lifespan, ASTM A760 Compliant 12 Gauge Corrugated Pipe, Easy Installation, Pre-Galvanized Steel Drainage Pipe for Stormwater Sewer Systems and so on.