Parker CPI 4 TZ-SS 316 Stainless Steel Compression Tube Fitting, Front Ferrule, 1/4" Tube OD Ferrule for providing a seal when compressed between two mating components Connects to tubing 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 Parker CPI BZ-316 series nut (sold separately)