The BRASS AIR BRAKE NUT 1/2" is engineered for use in air brake systems serviced by SAE J844 nylon tubing. This fitting meets DOT FVSS571.106 air brake specifications, ensuring safety and compliance in critical applications. Constructed from high-quality brass, it provides durability and resistance to corrosion, making it ideal for long-term use in automotive and industrial settings. The fitting is marked with DOT for verification and fits 1/2" outer diameter tubing, providing a secure connection in air brake systems.