... Zinc plated; Name: USA Milton/Industrial type air fitting(Pneumatic coupler, Pneumatic Component);Body: 1/4" (3/8"); Thread: ... steel; Thread size: 1/4", 3/8", 1/2"; Coupler type: Milton type, Industrial type; Surface treatment: Zinc plated; ... air pressure equipments; The quick couplers include: Female thread coupler, Male thread coupler, Coupler with hose tail, Male thread plug, Female thread nipple, ...