rectangular or square revision shaft, consisting of a lower part (1) with height adjustment (2) in a gravel flange box (5), at least one insertable stabilization line (3) and a cover (4),where the lower part (1) consists of vertical side walls (1a), which have an inward facing edge at their lower end (1b) and an inward facing edge in their upper part (1b) and which have at least one stabilization line (3),which is designed to be inserted diagonally into the rectangular or square subpart (1) and which has at least one border (3a) directed towards the cover (4), which is so high that it is in contact with the applied cover (4),and the lower part (1) is closed by means of a cover (4), which has a cover (4a) with side faces facing downwards (4b) which cover at least partially the side walls (1a) of the lower part (1).
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