DOT Push To Connect Air Brake Fittings Pneumatic Connection Solutions: Pneumatic Fittings, Air Fittings, Push To Connect Fittings, Pneumatic Connectors. DOT Push To Connect Air Brake Fittings, DOT Push-In Air brake Fittings The Push-in DOT Air Brake Fitting is strong, lightweight, impact-resistant and can be used in the most demanding air brake applications. Its push-to-connect design makes tube assembly fast and easy, no special tools are needed to assemble. Tight internal tolerances ensure resistance to contamination and optimal performance. The Push-in DOT design allows tubing joints to be made in just seconds for high productivity during vehicle manufacture, maintenance, repair and retrofit installation.