Parker CPI 4-8 GBZ-SS 316 Stainless Steel Compression Tube Fitting, Adapter, 1/4" Tube OD x 1/2" 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 Single ferrule compression fitting has fewer possible leak paths than twin ferrule fittings For use with stainless steel pipe and tubing