Separation device (100; 100') for separating fluid from a gas stream deriving from a connecting device, 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, in particular an assembly axis, extends longitudinally through the housing corpus and defines an axial direction, - wherein the housing (16, 18) comprises a 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 main separator element (22, 23) comprising a ring-shaped support body and 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 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, - wherein the first end disc comprises a radially outer peripheral wall element surrounding the main separator element (22, 23) and extending over an area of the main separator element (22, 23) in axial direction, and - a preliminary separator element which is disposed with regard to the axis radially outward from the radially outer peripheral wall element of the first end disc, - wherein said preliminary separator element is arranged in the housing (16, 18) in the flow pass of the gas stream between the raw gas inlet and the main separator element (22, 23), wherein the preliminary separator element and the main separator element (22, 23) are arranged in succession in direction of the flow pass of the gas stream, wherein the preliminary separator element comprises a hollow cylindrical coalescing filter medium comprising at least one coalescer material for removing fluid from the gas stream, wherein the preliminary separator element is arranged concentrically to the main separator element (22, 23), characterized in that the preliminary separator element is fixed to the second end disc, wherein the second end disc comprises a radially outer peripheral wall element surrounding the preliminary separator element and extending over an area of the preliminary separator element in axial direction and in that the preliminary separator element abuts against the radially outer peripheral wall element of the first end disc in such way that it is elastically fixed at the radially outer peripheral wall element 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, in particular an assembly axis, extends longitudinally through the housing corpus and defines an axial direction, - wherein the housing (16, 18) comprises a 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 main separator element (22, 23) comprising a ring-shaped support body and 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 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, - wherein the first end disc comprises a radially outer peripheral wall element surrounding the main separator element (22, 23) and extending over an area of the main separator element (22, 23) in axial direction, and - a preliminary separator element which is disposed with regard to the axis radially outward from the radially outer peripheral wall element of the first end disc, - wherein said preliminary separator element is arranged in the housing (16, 18) in the flow pass of the gas stream between the raw gas inlet and the main separator element (22, 23), wherein the preliminary separator element and the main separator element (22, 23) are arranged in succession in direction of the flow pass of the gas stream,