ILJ1051 Features: * Plated steel couplers have hardened steel balls and stainless steel springs * Coupler plugs are heat treated to reduce wear on critical mating surfaces * The automotive series couplers interchange with Tru-Flate 10 and 100 type series as well as units produced by other manufacturers * Maximum working pressure 300 PSI. * Metal type: Steel * 3/8"""" NPT Male Automotive Standard Series Type """"C"""" Coupler Warranty: * 1 yr warranty on material and workmanship