flange We supply ductile iron pipe fittings, flange adaptors and couplings as per ISO2531,EN545,EN598,BS4772. flange, ductile cast iron pipe fittings, pipe fittings Our enterprise has passed ISO9001:2000 Quality System Certificate, if need, we could provide Certificate Paper. Standards:ISO2531,EN545,EN598,BS4772 Material:ductile iron; grey iron; customer's drawings are accepted, usually GGG500-7, ...