The invention relates to a plunger (1), in particular for use as a dispensing- and/or sealing plunger of a container, comprising a main body (2) which has a side wall (3) provided with a sealing lip (4a, 4b, 4c, 4d, 4e), a front wall (5) in relation to the dispensing direction, and a rear wall (6) in relation to the dispensing direction and lying opposite the front wall (5). When unloaded, the at least one sealing lip (4b, 4c, 4d, 4e) projects radially, more particularly substantially at a right-angle, from the side wall (3). In addition, the at least one sealing lip (4b, 4c, 4d, 4e) and the main body (2) are integrally formed and produced from the same material.
