Midland Metal 2406106 Straight Reducer, 5/8 in 37 deg JIC Female Flared x 3/8 in 37 deg JIC Male Flared, Steel

JIC Reducer/Expander, Connection Size 1: 5/8-in, Connection Type 1: Female JIC, Connection Size 2: 3/8-in, Connection Type 2: Male JIC, Steel, 7/8-14 x 9/16-18 Thread