... butterfly valve, with various rubber seats, EPDM,NBR,VITON,PTFE,etc. very convenient Butterfly Val Rubber Butterfly ValveA/LT type ... Monel K500/DI+Epoxy coated/nylon coated/rubber coated. *Seat: Natural rubber/ Hypalon/EPDM/NBR/Viton/PTFE/Polyurethane*Stem: Stainless ... materials, applicable to various mediums8.Various of rubber seats, such as Natural Rubber, Hypalon, EPDM, Neoprene, NBR, Viton, PTFE, ...