A cartridge insertion assembly including apparatus with a pathway formed therein, a cartridge including a cartridge coupling element connectable to an activation mechanism disposed in the apparatus operative to cause a substance contained in the cartridge to be metered out of the cartridge, and a door pivoted to the apparatus that includes a door coupling element arranged with respect to the cartridge such that when the door is in a fully closed position, the door coupling element couples the cartridge coupling element with a coupling element of the activation mechanism.