Adapter for containers

An adapter is suitable to be mounted on and to cooperate with a neck of a container in order to allow a product which is contained in the adapter to flow out into an interior of the container, the adaptor comprising:

• at least one tank that is suitable to contain the product, the tank having a first opening that is suitable to transfer the product from the tank into the interior of the container,
• a movable means for sealingly closing the first opening,
• a means for activating the movable means for sealingly closing so as to allow the movable means for sealingly closing to open and the product contained in the tank to flow out into the interior of the container, wherein the movable means for sealingly closing is reversible,
• wherein the movable means for sealingly closing forms a topological space that is homeomorphic to a disk and comprises at least one or a plurality of flaps, so that if the adaptor comprises a plurality of flaps, the flaps have their sides in common with the side of another flap of the plurality of flaps and the distal end of which forms a junction point to all of the plurality of flaps, and in that the means for activating the movable means for sealingly closing is a lower wall of the tank, wherein the lower wall of the tank is configured to exert, when the movable means for sealingly closing is activated, a pressure on a proximal end of the flaps, and further wherein the tank comprises an outer ring which is integral with upper walls of the tank, wherein the outer ring of the tank is configured for cooperating with the neck of the container.