Abstract: An adaptor for attachment to the spigot of a standard disposable "bag-in-box" container for liquids such as wine or milk is disclosed. The adaptor allows the user to conveniently dispense liquid from the spigot to a glass using only one hand. The adaptor incorporates a collar for attachment to the spigot, and a handle which is activated by pressure from the glass to open the spigot. The handle pivots on two horizontal arms extending from the collar. Connected to the handle are two downwardly extending arms which meet at a central horizontally projecting protuberance. By pressing the handle, the V-shaped arms are rotated upwardly and the horizontal protuberance is pressed upwardly against the toggle lever of the spigot.