Abstract: A metering stopper for the neck of a bottle is described, with which a liquid medium is delivered in metered quantities. A tubular metering housing encloses a metering chamber which is provided with an outlet bore, the wall of which metering chamber has recesses for the admission of liquid into the inside of the metering chamber and in which a float is inserted which slides in sealing manner along the inner wall of the metering chamber. The float, the specific weight of which is in each case greater than the specific weight of the liquid to be delivered, has a cone, the tapered tip of which interacts with a valve seat in the outlet bore of the metering chamer.