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ASTM A53 Gr. B DN350 Hot Dipped 1/2 3/4 1 2 1.5 6 Inch Gi Zinc Round Tube Pre Galvanized Steel Pipe Best Pipe for Underground Water Supply, Find Details and Price about Steel Pipe Seamless Steel Pipe from ASTM A53 Gr. B DN350 Hot Dipped 1/2 3/4 1 2 1.5 6 Inch Gi Zinc Round Tube Pre Galvanized Steel Pipe Best Pipe for Underground Water Supply - Cangzhou Chengsheng Pipeline Equipment Co., Ltd.