Coupling, Pipe Fitting, Valves manufacturer / supplier in China, offering China Q235B API 5L /ASTM A53/A106 Gr. B/BS/JIS Black/Galvanized/Round Square Grooved/Threaded/Shouldered Seamless/Welded Carbon Steel Pipe, China Factory ERW Galvanized BS1387 API 5L JIS Shouldered Pipe with Shouder, China Factory Hot Galvanized Pre-Galvanized SS304 SS316 Adjustable Swivel Band Loop Hanger and so on.