Brass DOT Approved Air Brake Tube Fitting, 0.38 Inch Tube OD Union

NT100 nylon is the tubing type commonly spec'd for air brake systems on heavy trucks and trailers, so yes, this fitting is built around that application. It meets SAE and DOT FMVSS 571.106 requirements, which are the compliance standards tied to air brake tubing systems in commercial vehicles. The 0.38 inch tube OD size is what you'd match to your existing tubing diameter before ordering.