Carbon Steel, Stainless Steel, Alloy Steel High, Medium & Low Voltage Elbow, Flange, Three, Different-diameter Pipe ( Size Head), Pipe, Tube Cap ( Head), Chengcha Pieces Of Pipe, Thread Pipe, Steel Pipe Anti-corrosion Lining Plastic Pipe, Flexible waterproof Casing, Soft Rubber Joints, Pipe Filters, Decontamination Pipeline, Pipeline Shen Suqi, Flange Limit Expansion Joints, Two-sets-law.