A sealing element for cable leadthroughs or empty conduit leadthroughs is provided. The sealing element has a reception region for one or more cables or empty conduits, the reception region having a first fastening region spaced apart from a second fastening region, with the first fastening region having a diameter projecting beyond the diameter of the regions of the sealing element adjacent to it and with the second fastening region having a resilient peripheral sealing lip.