AP-4021 Replacement Humidifier Red Water Orifice - Compatible with Aprilaire

AP-4021 Replacement Humidifier Red Water Orifice — compatible with Aprilaire humidifiers. This part regulates the flow of water into the humidifier. Over time it can become clogged with sediment or mineral deposits and should be replaced annually for optimum performance. Be sure to clean or replace your in-line strainer (compatible with Aprilaire part # AP-4004) at the same time.

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