... --DN1400 2. K7&K9&K8 3.ling according to ISO4179 iso 2531 ductile iron pipe Standard: JIS, AISI, ASTM, GB, DIN ... standard toleranceShape: round,square,rectangularsurface: pickled, acid, polished, black,ectcertificate: ISO, BV, API, CSC,DNV,ectnormal length: 1000mm,3000mm,6000mmprice: factory ... Certificate is supplied with shipment, Third Part Inspection is acceptable. iso 2531 ductile iron pipe