rubber seal ring 1.Material:HNBR 2.High/Low ... 3/8 5/8 3/4 5/16 rubber seal ring 1)We have kinds of material : NBR,HNBR ... ,EPDM,SILICONE,VITON,NR,FLS,FFPM,PU,PTFE etc.2) High temperature and acid-alkali resistance ... O rings, rubber seals, rubber band, oil seal,water seal and rubber gaskets ect.Item nameO RINGSizeCustomized/standard ... daysCarton Size47*38*34cmOEM/ODMwelcome rubber seal ring