Product review (4 stars): Good mini maintenance kit to keep your Aprilaire 550 humming
Good mini maintenance kit to keep your Aprilaire 550 humming. It's not really necessary to get the full-blown $46 4793 kit, in my opinion. My only complaint is that the nozzle is not included in this kit as it is in the 4079 kit for other Aprilaire models. So I ordered that kit just for the nozzle. Also, the water feed tube crimps easily on sharp bends, which I have one inside my humidifier. Hair dryer to ease the crimp didn't help, but it still works.