Pump over unit and shaft

The invention relates to a pump over unit comprising a pump which is arranged in a shaft provided with liquid delivery and liquid evacuation, and comprising a pressure pipe and an automatic coupling fitting, which is arranged between the pump and the liquid evacuation and which consists of a fixed part and of a removable part. The fixed part (4a) of the automatic coupling unit (4) is mounted on the liquid evacuation, and the pump (2), the pressure pipe (6) and the removable part (4b) of the automatic coupling fitting are designed as a pre-assembled self-supporting unit. The shaft belonging to the pump over unit is a prefabricated, self-supporting plate profile and/or pipe profile provided with supply and evacuation openings. The outer surface of the pipe is functionally provided with ribs, whereby the ribs are preferably ring-shaped horizontal ribs. The supply and evacuation openings configured in the wall of the pipe are provided with a seal (11). The pipe has a base plate (9) which is prefabricated or mounted thereon and/or a cover.