This genuine Aprilaire replacement solenoid valve # 4040 includes inlet and outlet fittings, and is used on the models listed below. It ensures that the right amount of humidity is delivered into your home, and controls how much moisture enters your humidifier, making it possible to maintain proper humidity levels throughout your home.
Aprilaire: 220, 224, 400, 440, 550, 558, 560, 568, 600, 700, 760, 768
24 volts, 60 Hz, Orifice 3/32"
Disconnect the power and shut off your water supply before servicing. 120 volts could cause serious injury from electrical shock. You may also need to replace the inline strainer and orifice.