... flange: Size: DN32MM--DN3000MM (1 1/4"--120") Rubber material: EPDM, NBR, NR, Neoprene Rubber Joint without flange: Size: DN32MM--DN3000MM (1 1 ... /4"--120")Rubber material: EPDM, NBR, NR, NeopreneRubber sphere: Single sphere, Double sphereMain MaterialNo.NameMaterial1Outer/inner rubberNR,EPDM,NBR2Key frameNylon cord fabric3Pressurized ...