This compression union is made of brass, has compression connections, and is suitable for use with fuel and gas systems. It is made of brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability. This union connects two tubes in a straight run. It has a compression connection on both ends for connecting unthreaded tube. Tightening the nut against the sleeve creates a compression seal against leaks, and loosening the nut allows disassembly of the joined parts. This three-piece construction fitting – nut, sleeve, and body – can be used with copper, brass, aluminum, or plastic tubing and has an operating temperature range of -65 to +250 degrees F. This union compression tube fitting is suitable for use with fuel and gas systems, plumbing, refrigeration, and vacuum applications.