A fresh air system for an internal combustion engine, - having an inlet section for fixed connection to a periphery of the internal combustion engine, - having an air filter, which has a filter element, a filter housing for fixed connection to the periphery of the internal combustion engine and a housing cover for closing the filter housing, which housing cover can be removed from the filter housing to change the filter element, - having a connecting section for the fluid connection of the inlet section to the air filter, which connecting section is movably connected to the inlet section on the inlet side and is detachably connected to the housing cover on the outlet side, - wherein, to change the filter element when the inlet section is connected to the connecting section, the latter is detachable from the housing cover and adjustable relative to the filter housing to such an extent that the housing cover can be removed from the filter housing, characterised in - that the inlet section is connected to the connecting section by means of a plug-in connection, in which an inner part is inserted axially into an outer part, wherein a radial gap is formed between inner part and outer part, in which radial gap is arranged an elastic compensating body that runs around in the circumferential direction, - that the plug-in connection defines a flat cross section, which has a long diameter and, transversely thereto, a short diameter, - that the connecting section can be fixed to the housing cover by means of a locking connection, which has an assembly direction, - that the assembly direction runs substantially perpendicular to the long diameter of the cross section of the plug-in connection. - having an inlet section for fixed connection to a periphery of the internal combustion engine, - having an air filter, which has a filter element, a filter housing for fixed connection to the periphery of the internal combustion engine and a housing cover for closing the filter housing, which housing cover can be removed from the filter housing to change the filter element, - having a connecting section for the fluid connection of the inlet section to the air filter, which connecting section is movably connected to the inlet section on the inlet side and is detachably connected to the housing cover on the outlet side, - wherein, to change the filter element when the inlet section is connected to the connecting section, the latter is detachable from the housing cover and adjustable relative to the filter housing to such an extent that the housing cover can be removed from the filter housing, - that the inlet section is connected to the connecting section by means of a plug-in connection, in which an inner part is inserted axially into an outer part, wherein a radial gap is formed between inner part and outer part, in which radial gap is arranged an elastic compensating body that runs around in the circumferential direction, - that the plug-in connection defines a flat cross section, which has a long diameter and, transversely thereto, a short diameter, - that the connecting section can be fixed to the housing cover by means of a locking connection, which has an assembly direction, - that the assembly direction runs substantially perpendicular to the long diameter of the cross section of the plug-in connection.