The presently disclosed subject matter proposes an apparatus (42) and a method for transferring energy and/or a substance from a non-rotating component of an apparatus to a rotating device (43)—or vice versa—through an intermediary component (1, 1′). In one configuration, the intermediary component (1,1′) is a symmetrically arranged pair of tubes, useful in centrifugal separation, and which is subject to continuous rotation while tube ends are fixed in a lower, stationary range or stand still.