Corrugated Pipes, Waterstops, Expansion Joints manufacturer / supplier in China, offering High-Strength Corrugated Steel Pipe with Galvanized Coating (ASTM A653) , 3mm Wall Thickness, for Highway Culverts and Drainage Systems, Cold-Resistant Plate Expansion Joint with Flexible Polyisobutylene Sealant (-40º C) , for Arctic Region Highways and Frost-Prone Areas, Middle-Buried Rubber Waterstop Belt with Pre-Embedded Anchor Hooks, High Sealing Performance (Water Pressure Resistance ≥1.5MPa), for Dam Foundations and Und and so on.