Metering devices, particularly for adhesives and sealants, that can be placed on a flexible container by means of an adapted ring, a lever being connected to the ring, and pressing against the container, are known. The invention relates to a metering device whereon the lever is connected to the ring via a deformable spring plate. A push button is formed onto the lever as an extension. Thus, the one-piece metering device is inexpensive and can be produced without needing to be assembled.