Abstract: This invention relates to a connecting pipe for a liquid-tight connection to a sewer pipe. The connecting pipe comprises a connecting-pipe body having at least two spaced apart circumferential sealing chambers, where one of the sealing chambers contains a first sealing element comprising a ring seal proximate an inside surface of the sewer pipe and facing an opening-wall surface of the branch opening. The ring seal comprises at least one sealing-lip ring extending over an outer contour of this sealing chamber to contact the opening-wall surface of the branch opening. Another sealing chamber contains a second sealing element comprising a flexible filler proximate an outer surface of the sewer pipe and facing the opening-wall surface of the branch opening, such that a slot chamber extending from this sealing chamber to the opening-wall surface of the branch opening is sealingly bridged.