A connection apparatus for establishing a vacuum-tight connection, in particular a flange connection, between at least two components of a vacuum arrangement, having a first coupling element for coupling to the one component and a second coupling element for coupling to the other component. The first coupling element and the second coupling element are coupled to one another via a pivotable operating lever and the connection apparatus is adjustable by pivoting the operating lever from a first position in which the coupling elements have a larger spacing from one another into a second position in which the coupling elements have a smaller spacing from one another.