The invention relates to a line feed-through (1) for feeding a line (4) through a building component, comprising one or more sealing arrangements (2) for feeding the line (4) through, wherein the one or more sealing arrangements (2) have at least two sealing structures (51) lying opposite each other, wherein at least one first of the sealing structures (51) has an arrangement of elongate fins (53) adjacent to each other, the protruding ends of which lie against a second of the sealing structures (51) and thus seal the passage region.