The present invention is directed to a device for separating liquid from a gas stream within a liquid injected vacuum pump or compressor, said device (1) comprising: - two communicating vessels (6) having a common section (9) extending over at least a part of the height H1; - an inlet opening (2) positioned on the opposite side of the common section (9); - at least two bucket shaped vessels (10), each provided within one of the two communicating vessels (6); - a lid (12) comprising an outlet opening (4); characterized in that: - at least one of the two bucket shaped vessels (10) forms a fluid passage (11) between the wall (8) of the communicating vessel (6) and the wall of the bucket shaped vessel (10) for allowing a fluid to pass there through.