Ensuring you are Ready for the Road Ahead , HD Value 3/8"" Nylon Air Brake Tubing is made of strong virgin nylon to maintain the necessary fixed connection between couplings during vehicle operation. This flexible abrasion and kink resistant air brake system tubing meets the requirements of SAE J844 and DOT FMVSS 49 CFR 571.106. In addition, this heavy duty air brake hose offers excellent UV stability while also resisting oil, grease, gasoline, diesel fuel, road salts, and moisture. FleetPride is your First Click in Heavy Duty .