Aprilaire 4217 Replacement Scale Control Insert for 558/550A/550 Humidifiers
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About this Product
The Aprilaire 4217 Replacement Scale Control Insert is a humidifier scale control insert that is designed to hold the humidifier filter. The U shape design prevents scale build-up inside the cabinet of your Aprilaire humidifier. The Aprilaire 4217 Replacement Scale Control Insert is designed for Aprilaire humidifiers 558, 550A and 550.
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