Abstract: A stopper for racking-off operations that comprises a body which is substantially mushroom-shaped, is made of plastics, and is constituted by a tubular cylindrical element adapted to enter the neck of a bottle and close it, and by a head having a larger diameter than the cylindrical element and being monolithic therewith. The stopper for racking-off operations furthermore comprises a container that extends substantially from the head in the opposite direction with respect to the cylindrical element, the container having an opening, at the head, that is connected to a duct passing therethrough and in turn also connected to the internal cavity of the cylindrical element and therefore, when installed, to the inside of the bottle.