Description 5/8 Male O-Ring Boss (7/8-14) x 1/2 Female O-Ring Boss (3/4-16) - ORB Reducer-Expander - Steel This item is a suitable alternative for the following: 478-6410108, CHCA264, HCA264, 10MB8FB, 2H10120RF140RM, 341678, 7033X10X8, C2H10120RF140RM