Non-refilling devices

A non-refilling device for insertion with a neck portion of a container for liquids, the device comprising a tubular assembly adapted to be received at least substantially within said neck portion and having engagement means provided on an external surface thereof adapted for firm engagement with an internal surface of said neck portion, said assembly including a sleeve means a lower end portion of which is directed in use towards the interior of said container, said sleeve means being provided with a valve seat surface, there being provided a valve member adapted to seat against said seat surface in a closed position, said assembly further comprising a pouring member received in a force- or interference-fit within an upper, open end portion of said sleeve means and provided with an annular pouring lip, the device being further provided with a container closure means including an annular-sealing surface adapted in use to be in sealing engagement with said container neck portion, said annular sealing surface surrounding an annularly arranged projecting means adapted to engage removably with engagement means provided on the tubular assembly when the device is in a fully assembled condition, the construction and arrangement being such that, prior to use, the device is self-maintaining in said fully assembled condition in which each component thereof is engaged with an adjacent component prior to and during the application of the device to a container neck portion.