The pipe closing system has a spindle (40) with a ring (60) at the bottom end, towards the closure unit (80). At least two concentric bellows (50, 70) are at the ring (60). The inner bellows (70) is attached to the spindle (40), and the outer bellows (50) is fitted to a flange of the housing cover (11). The bellows (50, 70) are welded to the ring (60).
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