Patent ID: 8613854

Claim:
A filter element ( 21 ) for use in an openable filter housing ( 10 , 11 ), comprising: an annularly closed filter medium ( 22 ); an upper terminal disk ( 23 ) and a lower terminal disk ( 24 ) connected to end faces of the filter medium; a non-return diaphragm ( 27 ) secured to one of said end disks and arranged such that it covers with one side an inlet opening ( 16 ) in the filter housing ( 10 , 11 ); wherein the non-return diaphragm ( 27 ) includes an annular additional sealing surface ( 31 , 49 ) defining an axis and with which an outlet opening ( 17 ) of the filter housing is closable; wherein said additional sealing surface ( 31 ) is embodied as an axial sealing surface ( 31 ), said additional sealing surface ( 31 ) placed axially onto a drainage opening ( 18 ) in the filter housing such that said additional sealing surface ( 31 ) axially abuts against and completely covers over and axially sealing on said drainage opening ( 18 ) to sealably close said drainage opening; wherein said additional sealing surface ( 31 ) is larger in cross-section than said outlet opening ( 17 ), said additional sealing surface ( 31 ) placed axially onto said outlet opening ( 17 ) of said filter housing and axially sealing on said outlet opening ( 17 ).