Brass Compression Unions

Compression union / coupling. Made of brass. This fitting has a removable nut and compression sleeve on both ends. (Compression size = outside diameter "OD" of the tubing). Use with brass, copper, aluminum, polyethylene, polypropylene, and nylon tubing. For use with water, oil, air, and more. IMPORTANT NOTES: (1) When using plastic tubing, a brass tube insert (sold separately) should be used in conjunction with these fittings to insure a proper seal. (2) If using fittings in a system that supplies drinking water for human consumption, be sure to choose fittings with "lead free" in the description. Only lead free fittings should be used with drinking water. Click on individual items below for more details.