1. Standards:Double flange pipe produced according to ISO2531, EN545, BS4772, EN598, 2.Specification :Ductile iron flange fittings DN80-1200 3. Materials : Ductile iron 4. Pressure : PN10/PN16/PN25/PN40 5. Length according to customersâ?? requirement 6. Class K9 Or K12.