... , fluorosilicone,viton (FKM), viton DuPont & Dow elastomers, neoprene, HNBR, NBR + PVC, natural rubber, SBR, IR, IIR (butyl rubber), CR (neoprene), SBR ... . NSF-61 approved material, meets drinking water system requirements, FDA level 2) All manufacturing processes confirm to the ISO-9001, ISO14001 ... are accepted 7) Available in various sizes and colors Rubber hose