Abstract: The invention concerns a connection device for a centrifugal separator having a rotor (2) in a casing (1) and a tubular member (7) attached to the casing and forming an inlet passage for media supply into the rotor (2) and an outlet passage (9, 10) for media discharge therefrom. The connection device includes a connection unit (15) forming a first channel (20) connectable to a first one of the passages (8) and a second channel (21) connectable to a second one of the passages (9). The unit (15) forms a recess (16) to receive the tubular member (7) in such a manner that an end portion of the tubular member projects therefrom. Moreover, the unit (15) is releasably mounted in one single piece onto the tubular member (7). A locking member (19) engages the end portion to press the unit (15) axially against the casing to a determined position in relation to the tubular member.