Eaton Weatherhead 131X6 Brass CA360 Inverted Flare Brass Fitting, Plug, 3/8" Tube OD (Pack of 5) 5/8" inverted flare male plug for termination of 3/8" OD rigid tubing Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability Compression fitting for a tight seal on rigid tubing UL Listed for quality control