Parker A-Lok 4 ALOK-B-SET Brass Compression Tube Fittng, Ferrule Set, 1/4" Tube OD Ferrule set for providing a seal when compressed between two mating components Fitting connects to tubing on both ends Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability Suitable for use in chemical, petroleum, power generation, laboratory, and medical device plants Compatible with stainless steel, copper, rigid and semi-rigid plastic tubing