Separation device (100; 100') for separating fluid from a gas stream deriving from a connecting device of a compressed air system or of a vacuum pump, the separation device (100; 100') comprising a housing (16, 18) being designed to be replaceable connected with a connector head of the connecting device, - wherein a hollow cylindrical filter insert is received in the housing (16, 18) in the flow pass of the gas stream between at least one raw gas inlet and at least one clean gas outlet, - wherein an axis extends longitudinally through a cup-shaped housing corpus and defines an axial direction, - wherein the housing (16, 18) comprises the cup-shaped housing corpus and a housing cover for covering a first axial end of the housing corpus, wherein the housing cover is non-detachably connected to the housing corpus, - wherein the filter insert comprises - at least one first end disc and at least one second end disc disposed on opposite axial end face sides of the filter insert, wherein the first end disc faces the housing cover and the second end disc faces away from the housing cover, and - at least one main separator element comprising at least one hollow cylindrical coalescing filter medium comprising at least one coalescer material for removing fluid, in particular oil, from the gas stream, wherein the coalescing filter medium of the main separator element is configured to be flowed through radially by the flow pass of the gas stream, - wherein the first end disc is repeatedly bent in such way, that at least one circumferential annular trough is provided, wherein the trough opens toward the element interior of the hollow cylindrical filter insert, - wherein in the flow pass of the gas stream between the raw gas inlet and the filter insert, in particular between the housing cover and the first end disc, is arranged at least one preliminary separator element, characterized in that - the preliminary separator element comprises at least one coalescing filter medium, comprising at least one coalescer material for removing fluid, in particular oil, from the gas stream, - the preliminary separator element is substantially disc-shaped and comprises at least one central or coaxial pass-through opening, wherein the coaxial pass-through opening is designed for passing through the circumferential annular trough of the first end disc, and - that the preliminary separator element is held in position directly by its surrounding geometries of the area between the raw gas inlet and the filter insert without any fastening member, wherein the preliminary separator element is held in position directly by the housing cover, by the housing corpus and by the first end disc and wherein the preliminary separator element essentially extends in radial direction from the housing corpus to the annular trough of the first end disc. - wherein a hollow cylindrical filter insert is received in the housing (16, 18) in the flow pass of the gas stream between at least one raw gas inlet and at least one clean gas outlet, - wherein an axis extends longitudinally through a cup-shaped housing corpus and defines an axial direction, - wherein the housing (16, 18) comprises the cup-shaped housing corpus and a housing cover for covering a first axial end of the housing corpus, wherein the housing cover is non-detachably connected to the housing corpus, - wherein the filter insert comprises - at least one first end disc and at least one second end disc disposed on opposite axial end face sides of the filter insert, wherein the first end disc faces the housing cover and the second end disc faces away from the housing cover, and - at least one main separator element comprising at least one hollow cylindrical coalescing filter medium comprising at least one coalescer material for removing fluid, in particular oil, from the gas stream, wherein the coalescing filter medium of the main separator element is configured to be flowed through radially by the flow pass of the gas stream, - wherein the first end disc is repeatedly bent in such way, that at least one circumferential annular trough is provided, wherein the trough opens toward the element interior of the hollow cylindrical filter insert, - wherein in the flow pass of the gas stream between the raw gas inlet and the filter insert, in particular between the housing cover and the first end disc, is arranged at least one preliminary separator element, - the preliminary separator element comprises at least one coalescing filter medium, comprising at least one coalescer material for removing fluid, in particular oil, from the gas stream, - the preliminary separator element is substantially disc-shaped and comprises at least one central or coaxial pass-through opening, wherein the coaxial pass-through opening is designed for passing through the circumferential annular trough of the first end disc, and - that the preliminary separator element is held in position directly by its surrounding geometries of the area between the raw gas inlet and the filter insert without any fastening member, wherein the preliminary separator element is held in position directly by the housing cover, by the housing corpus and by the first end disc and wherein the preliminary separator element essentially extends in radial direction from the housing corpus to the annular trough of the first end disc.