The invention relates to a top for mounting on a container, preferably a can, comprising a fixed part mounted on top of the container, said fixed part having means for capturing the container, said fixed part further having an opening connecting the top of the container to the upper side of the fixed part. In the state where the engine starts, the variable valve timing mechanism is driven to a target value at the engine start by a second manipulated variable corresponding to a maximum variation speed of valve timing. The insert comprises a timepiece within an encased water-proof enclosure within the shower head insert.