Abstract: The invention relates to a device (1) for feeding one or more lines through an opening in a wall or a floor, comprising a frame (2) arranged in the opening, wherein the frame (2) forms one or more feed-through openings (3), which can be closed by means of one or more covers (6), and wherein brush bristles (11) are reversibly attached by attachment means to the inner wall (9) that forms the inner edge (4) of the feed-through opening (3), wherein the brush bristles (11) are arranged in such a way that the brush bristles cover the feed-through opening (3).