ductile iron universal coupling Wide Range Coupling for PVC Pipe coupling for ductile iron Pipe Ductile iron wide range Flexible Joint for pipe Ductile cast iron universal flexible coupling wide range ductile cast iron ranger coupling Wide Range Flexible Joint Universal Flexible Coupling Blue Color Ductile Iron Flexible Universal Dresser Coupling ISO2531EN545/598 Universal Joint Coupling Flexible Coupling Wide Range Universal Flexible Coupling  materail specification: body ductile iron GGG50 center sleeve carbon steel S235JR end ring ductile iron GGG50 rubber seal rubber EPDM bolt galvanized steel ISO898-1:1999 washer galvanized steel nut galvanized steel ISO898-2:1992 cap plastic