Separating shaft made of plastic, which is suitable for discharging two or more different, in particular aqueous liquids, which run into the separating shaft from the top, separately from one another into different waste water systems, the separating shaft (10) having a shaft pipe (11) in its upper region for the Has inlet of the liquids, a horizontal partition plate (14) in the installed state, which is arranged in the shaft pipe (11) at a distance from the upper end of the shaft pipe, at least two separately arranged in the partition plate (14) inlet openings (12, 13) for the respective incoming liquids, means for closing one of the inlet openings as well as connecting pipes (17, 18) for the discharge of the liquids in the lower region of the separating shaft, each of these connecting pipes (17, 18) in the interior of the separating shaft in flow connection with one each the inlet openings (12, 13), with d there is a continuous pipe connection between at least one inlet opening (12) and the connecting pipe (17) assigned to this inlet opening, characterized in that the separating shaft has at least one flap (27) pivotable about an axis in the area of at least one of the in the separating base arranged inlet openings (12, 13) via which this inlet opening (12, 13) can be closed.
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