4021 AP-4021 Compatible Aprilaire Humidifier Red Water Orifice for Models 112, 224, 330

Compatible replacement Aprilaire Humidifier Red Water Orifice. 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 (Aprilaire part # AP-4004) when you replace the orifice.

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