Midland Metal 20531 Straight Connector, 5/16 in Tube OD x 1/4 in Male NPTF, Brass

Male Adapter, Connection Size 1: 5/16 in, Connection Type 1: Push-to-Connect, Connection Size 2: 1/4 in, Connection Type 2: Male NPTF, Brass, 1/4-18 Thread, 0.56 in Hex, 0.98 in L, -10 to 200 deg F