... .DN30mm~DN5000mm flexible coupling,victaulic coupling,types of pump coupling 1. Product Data Sheet No.NameQtyMaterial1Casing1ZG230- ... 4502Short pipe2Q235A,20,16Mn3Seal ring1NBR,EPDM4BoltnQ235A,35,1Cr18Ni9Ti5NutnQ235A,20,1Cr18Ni9Ti 2:Features: 1)pipe fitting flexible ... 4:Dimension: 5:certificates obtained: flexible coupling,victaulic coupling,types of pump coupling