Back Home / Pipe & Tube Fittings / Brass Fittings / BRASS AIR BRAKE NUT 1/4″ BRASS AIR BRAKE NUT 1/4″ SKU: X1461X4 Categories: Brass Fittings, Pipe & Tube Fittings Nylon air brake fitting Meets DOT FVSS571.106 air brake specifications. These are used in air brake systems that are serviced by SAE J844 nylon tubing. DOT applications require that the fittings be marked with DOT on them. Air brake nut Size 1/4″ tubing o.d. Case Quantity: 10 Log In For Pricing