Abstract: A temporary closure device of an opening element on a support element and more particularly a temporary closure device of an opening element on a support element having a wall of the support element comprising an interior surface, an exterior surface and at least one main bore passing through the wall. The main bore has at least first and second surfaces substantially opposite, the device comprising a body, a base and at least one main means of non-elastic or non-mobile fastening to cooperate with the main bore. The device comprises at least one lock mounted mobile in relation to the body, the lock having at least two positions alternatively open or closed, the closed position defined so that the lock is able to come into contact and press against at least the second surface of the main bore to suppress any degree of mobility of the main means of fastening.