Parker A-Lok 6MSC4N-B Brass Compression Tube Fitting, Adapter, 3/8" Tube OD x 1/4" 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 Twin ferrule compression fitting for a leak-resistant seal in high-pressure applications For use with copper pipe and tubing