PROBLEM TO BE SOLVED: To provide an improved corrugator. SOLUTION: A corrugator (4) of an extrusion system (1) for forming a tubular plastic product (2) is a plurality of mold blocks (6, 9, 11) and a guide track (13). Along the way, the mold blocks (6) are paired and guided from the start area (14) of the guide track (13) toward the exit area (15) of the guide track (13) during the operation of the corrugator (4). The first return track (20, 21) that guides the mold block (6, 9, 11) from the exit area (15) to the start area (14) during the operation of the guide track (13) and the corrugator (4). ) And the individual mold blocks (6, 9, 11) can be removed from the first return track (20, 21) during the operation of the corrugator (4) and / or to the first return track (20, 21). It has a second return track (22, 23) that can be inserted. [Selection diagram] Fig. 1
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