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Aprilaire 4021 Red Orifice

Aprilaire 4021 Red Orifice is the tiny nylon components which accurately meter the flow of water into your humidifier. They allow a specific amount of water to go into the humidifier unique to the Models 112, 224 and 330.

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Get it straight from the source! Genuine Aprilaire replacement parts made by Aprilaire in Wisconsin U.S.A.

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