Abstract: The invention relates to a non-refilling device for insertion in the neck portion (3) of a container for liquids for example, fine spirits, the device comprising a sleeve member (4) adapted to be a secure fit within the neck portion (3), a one-way valve arrangement (6, 8), a pouring member (10) and a closure member (16, 20). While the device is being applied to the neck portion of the filled container, all the above components are maintained in an assembled condition by engagable members (28, 32) on the closure member (16) and the pouring member (10). When the container is opened normally, the action of unscrewing the closure member (16, 20) is adequate to overcome the action of the engagable members (28, 32) so that the container may be opened and resealed in a conventional manner.