... 416S. Sand316S. S, 17-4pHS, aluminum bronze and monel.resistant NBR, Viton, high temperature Viton, Hypalon, Silicon rubber PTFE Bushing: ... Glass backed PTFEover EPDM, PTFE over NBR, Neoprene Disc: Ni-plated ductile iron, Nylon coated ductile ... 416S. Sand316S. S, 17-4pHS, aluminum bronze and monel.resistant NBR, Viton, high temperature Viton, Hypalon, Silicon rubber PTFE Bushing: ...