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Comfortable, Reusable Particulate Respirator Facemask by RZ Mask - Meets N95 & N99 StandardsThis Aprilaire 4231 Humidifier Orifice (Yellow) is used in many Aprilaire humidifiers including the following Aprilaire humidifier models: 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.
The Aprilaire yellow humidifier orifice is a tiny nylon component that accurately meters the flow of water into your humidifier. The Aprilaire 4231 yellow orifice replacement is designed to allow a specific amount of water to go in to the humidifier which is unique to your model humidifier - it is used only in the specific Aprilaire humidifiers listed above. Note that the Aprilaire 4232 Humidifier Orifice (Blue) is for use with other Aprilaire humidifier models.
This is a genuine factory replacement Aprilaire 4231 replacement orifice also known as the Aprilaire 4231 yellow orifice replacement and April Air 4231 yellow orifice replacement.
