An assembly for an inhalation device(1) is provided, wherein the assembly comprises a storage chamber (15) configured to hold a quantity of a substance (2), a metering element (33) configured to be moved in a moving direction with respect to the storage chamber (15), and a sealing member (31) mechanically cooperating with the metering element (33), wherein the sealing member (31) comprises an opening (20) which receives the metering element (33), and wherein the sealing member (31) comprises at least one sealing lip (81) which is deflectable in a direction corresponding to the moving direction of the metering element (33). Furthermore, the use of a sealing member (31) for mechanical cooperation with a metering element (33) of an inhalation device (1) is provided, wherein the sealing member (31) comprises an opening (20) which receives the metering element (33), and wherein the sealing member (31) comprises at least one sealing lip (81), wherein the sealing lip (81) is configured to be deflected in a direction corresponding to a moving direction of the metering element (33).
