... ., Ltd.) is a leading ductile iron pipe manufacturer which produce water--cooled centrifugal casting ductile cast iron pipes according to ISO2531 and ... connection.(6) High strength ,lighter than gray iron,good corrosion resistance,no furring,small flow resistance,easy fixing,long ... , purches pipes fitting , PE sleeving, valves and etc. Ductile iron pipes & fittings comply with ISO 2531/BS EN 545/598