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DN300 DN350 DN400 Cast Iron Galvanized Anticorrosion Pipe Fitting Water Pipe Ductile Iron Pipe, Find Details and Price about Ductile Iron Pipe DN300 Ductile Iron Pipe from DN300 DN350 DN400 Cast Iron Galvanized Anticorrosion Pipe Fitting Water Pipe Ductile Iron Pipe - Shanxi Jingdong Pipe Industry Co., Ltd.