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Patent Granted The sealing device of the present invention is a device composed of several rigid plates or reinforcements articulated to each other, which is maintained in the position of the peripheral magnets from which it goes, adapts to the shape and cuts off the flow of the liquid. It consists of several solid plates or reinforcements (6), all of which are connected and articulated to each other by the synthetic rubber foam (3) of the rubber base of the base (1), to which are bolted magnets. permanent (2), a frisa (4) and a perimetric skirt (5). It serves for the purpose of wide waterways in vessels, vessels or pipes, among others. It solves the difficulty of adapting rigid covers to poly curved surfaces, and the sealing of large openings as well as being able to be positioned in any of the two media.