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Wholesale Ductile Iron Pip DN350 Ductile Iron Pipes for Sale. Certified Quality Standards: Complies with ISO2531/EN545/EN598 and GB/T13295-2019, passed ISO9001/14001/45001 certifications. 100% Quality Inspection: Every pipe undergoes 100% water pressure test and visual/function inspection before shipment. Flexible Customization: Offers full customization from samples/designs, including external coating and pipe wall thickness. Wide Application Range: Suitable for pipeline transport, drinking water, sewage, chemical industry, and construction projects. Established Manufacturer: Jingdong Pipe Industry with over 20 years experience, annual capacity exceeding 500,000 tons.