Midland Metal 20532 Straight Connector, 5/16 in Tube OD x 3/8 in Male NPTF, Brass

Male Adapter, Connection Size 1: 5/16 in, Connection Type 1: Push-to-Connect, Connection Size 2: 3/8 in, Connection Type 2: Male NPTF, Brass, 3/8-18 Thread, 3/4 in Hex, 1.06 in L, -10 to 200 deg F