An apparatus for separating at least two discrete volumes of a composite liquid into at least a first component and a second component, said appratus comprising:- a centrifuge having a rotation axis,- a set of bags comprising a colection and separation bag (1),- a collection tube (5),- at least two satellitbas (2, 3, 15),- a first and second flexible tube (17, 18), and- a three-way connector (16, 16a, 16b).