D.O.T. pneumatic fittings are specific fittings used to connect compressed air lines in road vehicle applications, such as trucks, trailers, and buses, in accordance with the standards established by the United States Department of Transportation (D.O.T.).

These fittings are designed to be used with compressed air lines that supply air brakes, air suspensions, and other pneumatic systems in these vehicles. They are made of brass or stainless steel to provide high resistance to corrosion and wear, as well as high durability.

D.O.T. pneumatic fittings are available in a variety of sizes and shapes to accommodate different types of lines and connections. They are designed to provide reliable sealing and high pressure resistance, to ensure the safety of passengers and drivers.

It is important to note that D.O.T. pneumatic fittings must be used in accordance with the specifications and standards established by the United States Department of Transportation, to ensure their safety and effectiveness. They undergo rigorous testing to ensure they meet established standards, and must be installed and maintained properly to ensure proper operation.