Parker CPI 6-6 FBZ-B Brass Compression Tube Fitting, Adapter, 3/8" Tube OD x 3/8" NPT Male Adapter for connecting pipes or fittings of different types Fitting connects to tubing on one end and has an NPT male connector on the other Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability Single ferrule compression fitting has fewer possible leak paths than twin ferrule fittings For use with copper pipe and tubing