Eaton Weatherhead 1873X4X4 Brass CA360 D.O.T. Air Brake Tube Fitting, Female Bulkhead Union, 1/4" NPT Female x 1/4" Tube OD Connects 1/4" NPT female fitting to 1/4" OD nylon tubing through a bulkhead Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability No hose clamps or ferrules are needed 150 psi maximum working pressure Meets D.O.T. FMVSS 571.106 air brake specifications