The AIR BRAKE INSERT is a high-quality stainless steel fitting designed for use in air brake systems serviced by SAE J844 nylon tubing. This insert meets DOT FVSS571.106 air brake specifications, ensuring reliable performance in critical applications. With a tubing outer diameter of 3/8", it is ideal for various automotive and industrial uses where durability and compliance are essential. Each fitting is marked with DOT for verification, making it a trusted choice for safety and reliability in air brake configurations.