... )Rubber O-RING NBR o-ring, EPDM o-ring,viton o-ring, Siliconeo-ring,FKM o-ringRubber Seal ring,seal circle,rubber seal ring2)AS568, JIS B 2401, Hardnes50-90 SHOREColors: black, blue ... )Rubber O-RING NBR o-ring, EPDM o-ring,viton o-ring, Silicone o-ring,FKM o-ringRubber Seal ring,seal circle,rubber seal ring2)AS568, JIS B 2401, Hardnes50-90 SHOREColors: black, blue ...