Operating material container and flange for same

The flange (5) has a borehole (10) provided for fixing the flange at an edge of an opening, where the flange has a form of a flat ring. Another borehole (12) is provided for fixation of an attachment part (4) at the flange. The former and latter boreholes form a rim at an angle of forty five degree, and a smaller step distributed borehole, in which a screw (13) and bolt of the attachment part is engaged. A circular seal is provided on a front side of the flange, where the front side faces an operating material container. The latter boreholes are distributed in circles of different radius. An independent claim is also included for an operating material container that comprises a flange.