A seal that can be used in groove surfaces, in permanent glasswork, or in casement windows and is comprised of a sealing profile 1 having a profile base 3 and an anchoring wedge 2. On the side of the profile base 3 that is opposite the anchoring wedge 2, a sealing pad 4 and a sealing lip 5 are formed, and a nose strip 6 is positioned on the end of the sealing pad 4. These parts of the sealing profile 1 are made of a thermoplastic rubber. They are to be joined to the semi-finished closure of the window shortly following extrusion by the manufacturer. The corresponding semi-finished product can then be cut to size and joined by the window builder with the sealing profiles 1 being bonded together at the same time so that the entire seal is guaranteed. This makes the window builder's step of "inserting the sealing profile" completely unnecessary.