Parker A-Lok 6FSC4N-316 316 Stainless Steel Compression Tube Fitting, Adapter, 3/8" Tube OD x 1/4" NPT Female Adapter for connecting pipes or fittings of different types Fitting connects to tubing on one end and has an NPT female connector on the other Chemically hardened type 316 stainless steel for higher strength and greater corrosion resistance than untreated stainless steel Twin ferrule compression fitting for a leak-resistant seal in high-pressure applications For use with stainless steel pipe and tubing