Name: USA Industrial Type Air Couplers(Air Coupler, Air Tool Coupler ... 1/4", 3/8", 1/2"; Name: USA Industrial Type Air Couplers, Milton type(Air Coupler, Air Tool ... on hose barb; Material: Brass, steel; Thread size: 1 / 4", 3 / 8", 1 / 2"; Coupler type: Milton type, Industrial type ... Male thread socket, Socket with hose tail, Male thread plug, Female thread plug, Hose plug, etc. Before delivery, all ...