The invention provides for a medical device kit comprising a medical instrument (918) with a first connector (200, 946, 948). The first connector comprises at least one first electrical connection (204). The first connector further comprises a sealing cavity (212) at least partially surrounding the at least one first electrical connection. The sealing cavity comprises a sealing surface (114) and a wedging surface (214). The medical device kit further comprises a sealing cap (400). The sealing cap comprises a sealing tube (401) with an inner cavity (402). The sealing tube has a flexible tip region (404). The wedging surface is operable for forcing the flexible tip against the sealing surface to form a flexible tip seal (600) that seals the at least one first electrical connection within the sealing tube.
