Anderson Metals Brass Compression Tube Fitting, Nut, 3/4" Tube OD Nut for connecting to a tube or fitting Connects to copper, brass, aluminum, or steel tubing Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability Operating temperature range of -65 to +250 degrees F Resists mechanical pullout for a more secure connection These fittings contain lead and are not allowed by federal law to be installed for potable water use in the U.S.A. and its territories.