Aprilaire's 4040 24 V 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.

Aprilaire® Solenoid Valve, 1/4 x 7/16 in Nominal, 3/64 in Orifice, 2-1/2 in L

• Ensures that the right amount of humidity is delivered into your home
• Controls how much moisture enters your humidifier, making it possible to maintain proper humidity levels throughout your home
• Compatible with all Aprilaire humidifiers except for commercial units and residential models 800, 330, 445, 110, 112, 350 and 360
• 2.3 W power rating
• For 400, 500, 600, 700, 440, 560, 760 humidifiers