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Diameter 300mm 350mm 420mm 700mm C25 C40 ISO2531 Certification 6m 12m Long Ductile Iron Pipe, Find Details and Price about Ductile Iron Pipe K9 Ductile Iron Pipe from Diameter 300mm 350mm 420mm 700mm C25 C40 ISO2531 Certification 6m 12m Long Ductile Iron Pipe - Shandong Hongqiao Energy Equipment Technology Co., Ltd.