A hearing aid device comprises a body member having a through-going canal and a receiver comprising means for attaching a dome. The device comprises a pull out string for inserting the body member in an ear canal and to pull out the body member from the ear canal. The device comprises a pull out string displaceable arranged within a pull out string canal of the body member. The pull out string comprises a through-going bore and the device comprises means for maintaining the pull out string in a first position within the pull out string canal, where in a first position the through-going canal and the through-going bore constitute a through-going vent while inserting the body member into the ear canal. The device comprises means for bringing and maintaining the pull out string into a second position, where in a second position the pull out string blocks the through-going canal.