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Description
This Aprilaire 4231 Humidifier Orifice Replacement is used in many Aprilaire humidifier models including the Aprilaire 400 Humidifier, Aprilaire 400A Humidifier, Aprilaire 400M Humidifier, Aprilaire 500 Humidifier, Aprilaire 500A Humidifier, Aprilaire 500M Humidifier, Aprilaire 550 Humidifier, Aprilaire 550A Humidifier, Aprilaire 558 Humidifier, Aprilaire 560 Humidifier, Aprilaire 560A Humidifier, Aprilaire 568 Humidifier, Aprilaire 600 Humidifier, Aprilaire 600A Humidifier, and the Aprilaire 600M Humidifier. This Aprilaire 4231 yellow orifice is designed to allow a specific amount of water to go into the humidifier which is unique to your model humidifier.
Pictures show the item in different angles. It is sold as an individual item, not a 2 pack.
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Filtration for the Whole House
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