Aprilaire 4655 Manual Humidifier Control. This item is a replacement for the Aprilaire 4016. The Aprilaire 4655 Manual Humidifier Control fits the Aprilaire humidifier 350, 360, 400M, 500M, 600M, and 700M

Actual Measurements: 3.375H x 1.9375W x 5.125D (inches)

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Click here for the Aprilaire 4655 Installation Instructions