Legris 0105 04 10 Brass Compression Tube Fitting, Connector, 4 mm Tube OD x 1/8" BSPT Male Adapter for connecting pipes or fittings of different types Fitting connects to tubing on one end and has a BSPT male connector on the other Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability Ferrule compression fitting for a leak-resistant seal For use with copper, nylon, or plastic tubing