Components Materials Symbol Reference Grade or designation Body Ductile iron DI/SG BS 2789 420/10 Bolts, nuts and washer Hot dip galvanized HD BS 4190 - Sealing Gasket (Top) Synthetic rubber EPDM MS 672:99/AS 1646 66-75-IRHD Sealing Gasket (Bottom) Synthetic rubber EPDM MS 672:99/AS 1646 66-75-IRHD
