This task is achieved in that the circumference of the first free end (9) of the hose (8) is smaller than or equal to the circumference of the passage duct (4) of the free end of the pipe section (3), that the width (b) of one of the long sides (14) of the first free end (9) of the hose (8) is larger than the width or diameter (d) of the passage duct (4), that areas of the hose (8) can be inserted into the passage duct (4) by compressing the long side (14) and that the hose (8) is held in the passage duct (4) by a preload force after having been inserted.
