QINGDAO FLOURISH METAL WORKS LTD.is a manufacturer and exporter for ductile iron pipes and fittings,flange adaptors and couplings,valves,manhole covers,ect,The centrifugally caxt ductile iron pipes are manufactured and tested according to ISO 2531:1991 (E)/BSEN 545 standard with sizes of 6 meters in length and from DN 80mm toDN 2600 mm with up-to-date technology and equipment...