Midland Metal 2406126 Straight Reducer, 3/4 in 37 deg JIC Female Flared x 3/8 in 37 deg JIC Male Flared, Steel

JIC Reducer/Expander, Connection Size 1: 3/4-in, Connection Type 1: Female JIC, Connection Size 2: 3/8-in, Connection Type 2: Male JIC, Steel, 1-1/16-12 x 9/16-18 Thread