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High Quality ISO2531 Double Flanged C20 C25 C30 C40 C50 C64 Wall Thickness 6mm 12mm 20mm 30mm Ductile Iron Pipe, Find Details and Price about Ductile Iron Pipe Ductile Iron Pipe Fitting from High Quality ISO2531 Double Flanged C20 C25 C30 C40 C50 C64 Wall Thickness 6mm 12mm 20mm 30mm Ductile Iron Pipe - Shandong Zhongtong Boda Steel Co., Ltd