Name: USA Industrial Type Air Couplers(Air Coupler, Air Tool Coupler, Quick Fitting), Milton type; Body size: 1/ ... : USA Industrial Type Air Couplers, Milton type(Air Coupler, Air Tool Coupler, Quick Fitting); Body size: 1/4", 3 ... Thread size: 1 / 4", 3 / 8", 1 / 2"; Coupler type: Milton type, Industrial type; Surface treatment: Zinc plated, acid ... , surface finishing and thread test. Industrial Coupler