The end caps are a part of the system components of the Gelbau Contact-Duo and Quadro-Profiles. They serve to seal off the ends of the switching strips in a moistureproof configuration. The Contact-Optima-Profile end caps are used only to close off the compensation chamber. Various types of connection are available. The caps can be supplied in NBR and EPDM, and in different colours, to suit the profiles concerned.