Apparatus for separating liquid from air, featuring a cup-shaped housing with a filter element (210, 220) disposed therein, in particular designed as annular coalescer and a fitting (50; 50') which can be connected to a connecting head of a prime mover, in particular of a compressor, for example of an air compressor, and which is detachably connected to the cup-shaped housing, wherein the cup-shaped housing is designed to receive at least the filter element (210, 220), in particular designed as an annular coalescer, for separating liquid from air, and wherein the cup-shaped housing features a housing cover for closing its open front side, wherein the housing cover features at least one centrally disposed opening on the clean air side for discharging the filtered clean air, and wherein the housing cover features at least one raw air intake (22, 23) on the raw air side disposed off-centered for supplying raw air, wherein for sealing between the raw air side and the clean air side, in particular the raw air intake (22, 23) on the raw air side from the opening on the clean air side, at least one sealing surface (60; 60'; 60") is disposed at least in some areas on the exterior side of the housing cover facing away from the interior space of the cup-shaped housing, wherein the opening on the clean air side is designed to receive the fitting (50; 50') extending through the housing cover in the direction of the longitudinal axis of the cup-shaped housing, and wherein the housing cover features, in the area of the opening on the clean air side, at least one area which can be detachably connected to the fitting (50; 50'), wherein the sealing surface (60; 60'; 60") is disposed on the housing cover in such a way that, when the housing cover is connected to the fitting (50; 50'), the sealing surface (60; 60'; 60") is disposed between housing cover and fitting (50; 50') or between housing cover and a connecting head connected to the fitting (50; 50') and seals the raw air intake (22, 23) on the raw air side from the opening on the clean air side, characterized in that i. the fitting is designed in such a way that, when the housing cover is connected to the fitting (50; 50'), at least one liquid drain (28, 280) disposed on the clean air side is disposed between the housing cover and the fitting (50; 50') for discharging the separated liquid from the interior space of the cup-shaped housing, or ii. the cup-shaped housing, in particular the area which can be detachably connected to the fitting (50; 50') of the housing cover is designed in such a way that, when the housing cover is connected to the fitting (50; 50'), at least one liquid drain (28, 280) disposed on the clean air side is disposed between the housing cover and the fitting (50; 50') for discharging the separated liquid from the interior space of the cup-shaped housing, or iii. a liquid drain is realized through at least one through hole which is radially disposed between the opening on the clean air side and the raw air intake (22, 23) and extends in the axial direction through the housing cover from the interior side of the housing cover facing the interior space of the cup-shaped housing to the exterior side of the housing cover facing away from the interior space of the cup-shaped housing, further characterized in that the sealing surface (60; 60'; 60") is disposed on the housing cover in such a way that it (60; 60'; 60") seals the raw air intake (22, 23) from the liquid drain. i. the fitting is designed in such a way that, when the housing cover is connected to the fitting (50; 50'), at least one liquid drain (28, 280) disposed on the clean air side is disposed between the housing cover and the fitting (50; 50') for discharging the separated liquid from the interior space of the cup-shaped housing, or ii. the cup-shaped housing, in particular the area which can be detachably connected to the fitting (50; 50') of the housing cover is designed in such a way that, when the housing cover is connected to the fitting (50; 50'), at least one liquid drain (28, 280) disposed on the clean air side is disposed between the housing cover and the fitting (50; 50') for discharging the separated liquid from the interior space of the cup-shaped housing, or iii. a liquid drain is realized through at least one through hole which is radially disposed between the opening on the clean air side and the raw air intake (22, 23) and extends in the axial direction through the housing cover from the interior side of the housing cover facing the interior space of the cup-shaped housing to the exterior side of the housing cover facing away from the interior space of the cup-shaped housing,