Abstract: An exchangeable closing and pouring cap for a container for liquids having an opening for pouring, in particular a soft drink bottle, is provided with suitable connecting threads for placing the cap on the pouring opening, an outlet in the cap for the liquid connection between the container and a pouring lip on the cap, a sealing device which is movable between a closing position and an opening position thereby closing and opening the outlet respectively. The sealing device encloses a plunger element which can be moved to and from in the outlet. The cap is also provided with an air inlet which synchronically with the outlet is also closed and opened respectively.