💡 Elevate Your Home's Comfort with Precision Control! User-friendly design makes replacement a breeze for any DIY enthusiast. Engineered for durability, ensuring long-lasting functionality. Compatible with a wide range of Aprilaire models for effortless upgrades. Transform your home into a sanctuary with perfect humidity levels. Maintain 35%-45% humidity to reduce respiratory issues and allergies. 24V power Whole house compatibility 0.5 oz precision The Aprilaire 4040 Solenoid Valve is a vital replacement part for various Aprilaire Whole House Humidifiers, designed to regulate water flow and maintain optimal humidity levels in your home, promoting a healthier living environment.