Reducing Union, Connection Size 1: 5/16 in, Connection Type 1: Male Flare, Connection Size 2: 1/4 in, Connection Type 2: Male Flare, Brass, 1/2-20 x 7/16-20 Thread, 1/2 in Hex, For Use With: Copper, Brass, Aluminum, Steel Hydraulic Tubing, 1.28 in L, 1200 psi, -65 to 250 deg F, Additional Information: 0.032 in Tube Wall, 0.040 lb Weight