A sealing cap for a container for holding a medical liquid comprising a cap body, which bounds an interior and has at least one opening, and at least one connection device, which is arranged on the cap body and to which a conveying device for feeding a medical liquid into the container or for removing a medical liquid from the container can be connected. The connection device has a sealing element, arranged on the cap body. The connection device has a break-off piece, which, in an initial state, is firmly connected to the cap body and covers the outer face of the sealing element in the outward direction. The break-off piece is connected to the cap body by means of a pre-determined breaking point. In addition, the sealing element is convex on the outer face.
