Brennan N0319-S-08-SS Stainless Steel Compression Tube Fitting, Ferrule Set, 1/2" Tube OD Double ferrule for providing a seal when compressed between two mating components Fitting connects to tubing on both ends Stainless steel for strength and resistance to scaling and corrosion For use with Brennan double-ferrule compression fittings Set includes one front and one back ferrule