The Aprilaire 4040 is compatible for use in all Aprilaire humidifier models EXCEPT the following:
The Aprilaire 4040 Humidifier Solenoid Valve - 24 Volt promotes the flow of water into your Aprilaire humidifier. The Aprilaire humidifier solenoid valve should be replaced as needed to maintain the performance of your Aprilaire humidifier. We recommend that the wiring of this Aprilaire solenoid valve during replacement be done by a professional to prevent the possibility of electric shock.
Aprilaire 4040 Humidifier Solenoid Valve - 24 Volt specifications:
This humidifier water valve is a genuine factory replacement and is also known as the Aprilaire 4040 valve replacement and April Air 4040 valve replacement.