Eaton Weatherhead 60X4 Compression Sleeve, CA360 Brass, 1/4" Tube OD, 0.3400" Sleeve OD Sleeve for a tube compression fitting Connects to 1/4" copper, brass, aluminum, or plastic tubing Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability Operating temperature range of -65 to +250 degrees F No flaring tool required for assembly