flexible coupling 1.NPS:1"~200" 2.material:ductile iron,NBR,EPDM 3.long-term partner:FLSmidth ... of fire protection,mines,power,chemical industry and urban water supply and discharge. When it is connected with pumps,valves ... can be customized as per the actual sizes. 2:material we supply No.NameQtyMaterial1Casing1ZG230-4502Short pipe2Q235A,20,16Mn3Seal ring1NBR,EPDM4BoltnQ235A,35,1Cr18Ni9Ti5NutnQ235A ...