Size: the thread size of -8AN is 3/4-16 UNF, the thread size of -8AN ORB is 3/4-16 UNF. Sealing： The ORB side is sealed with an O-ring. Material: The -8AN to -8AN orb reducer is made of aluminum alloy 6061-T6 which is an anodized black surface, and the O-ring is made of Nitrile rubber.
