... like NBR, HNBR, SI, Viton, FKM, ect.will be available for NSF o-ring Rubber O-Ring1. Offer a wide range ... , DVGW, FDA and ROHS approved.4. Various materials and hardness for your option, including Buna-N (NBR), HNBR, VITON, Silicone, ... , Neoprene, HYPALON, etc.Our represent excellent value for money in terms of quantity, quality and convenience for maintenance engineers. They contain either metric ...