1. Pipe duct for a pipe to be passed through a wall, in particular a concrete wall, having a pipe lining preferably consisting of plastics material spacially enclosing the pipe and embedded in the wall, at least one seal being disposed between the pipe and the pipe lining and the pipe lining being provided at least in an end portion with an annular flange extending around the pipe orifice and facing away from the pipe lining, characterized in that the flange (22) projects axially above the orifice (3') of the pipe duct at least by its external marginal area and that the flange (22) is formed elastically bendable for adjustment or bending at least of said projecting marginal area under the action of pressure in the direction towards the pipe lining (3) in the plane of the orifice (3'), for instance by pressing against a shuttering wall (14, 15).
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