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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
Note: Manufacturer has discontinued this item. There are currently no replacement available at this time
The Aprilaire 4166 fits the following humidifier models:
The Aprilaire 4166 Humidifier Replacement Knobs are replacement knobs, and attach to the front cover of the housing.
Each unit requires two knobs. Also referred to as door nuts.