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700mm Oil Gas Water Line K7 K8 K9 C25 C30 C40 DN500 DN600 DN1000 Ductile Cast Iron Pipe Tube, Find Details and Price about Ductile Cast Iron Pipe Ductile Cast Iron Tube from 700mm Oil Gas Water Line K7 K8 K9 C25 C30 C40 DN500 DN600 DN1000 Ductile Cast Iron Pipe Tube - Shandong Runhai Stainless Steel Co., Ltd.