Tramec 31403 3/8" Air Brake Hose Field Kit, Two End Fittings 1/2" NPTF KIT FEATURES:Swivel Ends Reduce Residual Torque In Hose For Longer Life, No Need To Disconnect Both Ends To Service The Brake System, Meets DOT 106 & SAE J1402. Components in contact with the air are made of corrosion resistant brass and nylon to improve air system life.