the invention relates to a sealing connecting element , a sealing end piece and a seal . in practice different seals are known which are produced as three dimensional structures and then given to the customer . the production , wherein profile strips are ready - made by cutting and adhesion to form the three dimensional structures or wherein the three dimensional structure is obtained by means of corner injection molding , is very costly . in order to simplify the production of seals , it is provided in accordance with the invention that sealing connecting elements and / or sealing end pieces are to be produced as separate molded parts made of a thermoplastic elastomer and these molded parts to be connected , shortly before the installation of a seal , to sealing profile strips to form a complete seal .