Abstract: A filter for a fluid under pressure comprising a container including a filter vessel (1) and cover (2) for clamping against the filter vessel. A support basket (12) adapted to be inserted into the filter vessel includes a flange (11) having an inwardly and upwardly open profile (15, 16). A filter sealing element (18) of an annular filter bag carrier (17) may be inserted into the open profile (15). In order to obtain a complete sealing effect, particularly against the passage of the unfiltered fluid into the filtered fluid in the filter, an upwardly and outwardly open groove (19) is provided in the profiled filter sealing element (18), which groove receives an inner O ring (20).