The AIR BRAKE INSERT is crafted from high-quality stainless steel, ensuring reliability in demanding air brake systems. Designed for 5/8" outer diameter tubing, this insert is compatible with SAE J844 nylon tubing and meets the stringent requirements of DOT FVSS571.106. Ideal for use in commercial vehicles, it provides a secure and leak-free connection in air brake applications. The insert is marked with DOT for compliance, making it a trusted choice for professionals in the automotive and industrial sectors.