As a manufacturer we can offering high-quality silicone valve core at rational prices and best service. Features:1) Available material: materials for silicone, NBR, fluorosilicone, viton (FKM), viton DuPont & Dow elastomers, neoprene, HNBR, NBR, natural rubber, SBR, IR, IIR (butyl rubber), CR (neoprene), SBR, ACM, etc. NSF-61 approved material, meet drinking water system2) All manufacturing ...