Fitting Type: UNION Material: BRASS Assembled Product Length: N/A Assembled Product Height: N/A Assembled Product Width: N/A . Flare Union Coupling • Tube to tube • May be used with copper, brass, aluminum, plastic, and welded steel hydraulic tubing or any tube which can be flared • Resists mechanical pull-out • Good vibration resistance • If more tube support required use long nut • Applications include: gas, fuel, oil, air, L.P. gas, water, refrigeration and chemicals not corrosive to brass and tubing materials