a cartridge insertion assembly including apparatus with a pathway formed therein , a cartridge insertable into the pathway , the 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 .