Patent ID: 7678398

Claim:
An insert for insertion into a container for liquids under pressure, which insert is freely movable in the container, the insert comprising an insert member having an outer wall, the insert member defining a component chamber for receiving an active substance, a pressure chamber for effecting an introduction of the active substance into the liquid when the container is opened, wherein a pressure of the pressure chamber is in an equilibrium with the pressure of the container through at least one small outer bore in the pressure chamber, the insert which is freely moveable within the container on a surface of the liquid assumes a stable floating position, so that the outer bore is always located above the liquid level and causes an optimized pressure equalization of the pressure chamber and the pressure of the container, wherein the insert member has an asymmetrical center of gravity and a drop-shaped or egg-shaped cross-section along an entire longitudinal axis of the insert member from a lid to an opposing outer wall so as to produce an asymmetrical center of gravity which creates the stable floating position, perpendicular to the longitudinal axis the insert member has a rectangular cross-section, a lid simultaneously closes the pressure chamber and the component chamber, and in the stable floating position of the insert makes possible a horizontal discharge of the components into the liquid, wherein the component chamber is cylindrical and arranged parallel to the longitudinal axis of the insert member so as to sustain the asymmetrical center of gravity of the insert member, wherein the outer bore is located in the outer wall at a position farthest removed from the center of gravity of an area of the drop-shaped or egg-shaped cross-section.