... c.s DN:2"~48". Disc: Ni-plated ductile iron, Nylon coated ductile iron, 304S. S, 316S. Body: Cast iron, carbon steel ... EPDM, PTFE over NBR, Neoprene Disc: Ni-plated ductile iron, Nylon coated ductile iron, 304S. S, 316S. Body: Cast iron, carbon steel ...