Manhole Covers, Flanges, Valves manufacturer / supplier in China, offering ISO2531, En545, En598 Ductile Cast Iron Double Flanged Concentric Reducer Taper, ANSI B16.9 ASTM A234 8 Inch Welded Carbon Steel Pipe Fitting Lateral Tee, Carbon Steel 90 Degree Elbow Long Radius Butt Weld Fitting and so on.