Tramec Sloan S378AB86 Air Brake Male Connector with Spring Guard - Brass Construction, 3/8" Hose x 1/2" Pipe, 225 PSI Max Working Pressure - Also Try Velvac 500078
Tramec Sloan 31402 Quick Fit Kit - 3/8" Rubber Air Hose x 3/8" NPTF Swivel, Meets DOT 106 and SAE J1402 - Permanent solution for your damaged air brake lines, One package will repair two 3/8″ rubber air brake lines, Swivel Fittings