Abstract: A locking system defined between a stationary support housing defining an interior space to be closed by a closure, and a closure movably mounted upon the stationary support housing between an open, unlocked position and a closed, locked position, includes first and second cams fixedly mounted upon the closure, and a rotatable control element rotatably mounted upon the stationary support housing. When the closure (10) is disposed in its closed, locked position within the stationary support housing (11), the first cam (32) is engaged with a first end (27) of the rotatable control element (25).

Abstract: An opening stopper of elastomeric material, especially for sealing lacquer outflow openings in automotive vehicle bodies, comprising a closed bottom, an elastically shapable flange covering the edge of the workpiece opening, a collar connecting the bottom to the flange, and a shoulder disposed at the outer surface of the collar, said shoulder engaging behind the oppositely disposed opening edge, wherein the shoulder is formed by a circumferentially extending free edge of a lip configurated like a conical disc which is tied at a location level with the countersunk bottom and extends obliquely outward towards the flange.