Closing cover for a container provided with a seal

An enclosure arrangement for closing a container of liquid comprising:

• a lid;
• and
• a stirrer,
• wherein said lid has a spindle passageway adapted to receive a rotatable elongate body of said stirrer, said rotatable elongate body of said stirrer having a uniform diameter at said spindle passageway and within said container, said spindle passageway being adapted to allow the rotatable elongate body to rotate in said spindle passageway,
• and wherein said spindle passageway includes an annular seal with an opening of a same diameter as said rotatable elongate body of said stirrer, adapted to receive the rotatable elongate body, the opening having an inside peripheral face with a helical sealing lip, said helical sealing lip engaging the outside surface of said rotatable elongate body of said stirrer to maintain sealing between said rotatable elongate body of said stirrer and said annular seal, said annular seal having a circular sealing lip located above and spaced from the helical sealing lip when said annular seal is in its mounted state in said lid closing said container, the circular sealing lip being adjacent to an opening of the annular seal opposite a surface of the annular seal adapted to face inside the container.