Aprilaire 4040 Solenoid Valve for Models 400, 500, 600, and 700

The Aprilaire 4040 24-Volt solenoid valve allows water to come into your humidifier and controls how much moisture enters your humidifier, making it possible to maintain proper humidity levels throughout your home. Both the inlet and outlet are threaded 7/16" - 24 UNS for accepting a compression fitting for 1/4" tubing. The inlet includes the compression fitting & ferrule. For the outlet, your existing compression fitting is reused. Compatible with the following Aprilaire Humidifiers: Model 400 Model 500 Model 600 Model 700   Proper humidification of your home is important for protecting your family’s health and the beauty of your home. The 4040 24 Volt Solenoid Valve controls the amount of water that enters your humidifier, ensuring that the right amount of humidity is delivered into the air every time it turns on. Usually installed by your contractor, the solenoid valve is part of the core of your humidifier, making it possible for you to adjust moisture levels with precision and accuracy.