Patent ID: 7594590

Claim:
A sealing plug for liquid-tight sealing a strip of a plurality of interconnected strips suitable for forming a cover of a liquid-filled container, the strip comprising at least two hollow flotation elements, the sealing plug comprising: an end plate, at least two protrusions extending from the end plate, each protrusion comprising at least two lips, at least one of the at least two lips encircling the protrusion, wherein said at least two lips extend in a first direction, said first direction including an angle α with a second direction, the second direction being a direction in which the sealing plug is to be introduced into the hollow flotation elements, said angle α being larger than 90° and smaller than 180° or smaller than −90° and larger than −180° and wherein the protrusions and the at least two lips have a circular shape in cross-section and wherein said at least two lips have decreasing height with the tallest lip being positioned closest to the end plate and the shortest lip being positioned farthest away from said end plate.