Key Features

• Exact Replacement for 4040 & Key Humidifiers: Directly replace your faulty solenoid with this precise match designed for 4040 Humidifier models and compatible systems (including Aprilaire 400, 500, 600, 700 series). Fits common replacement part numbers like NO.100006735, A2012-S118, B2035-S2/S5/S54/S55, B2015-S51/S54/S58/S65/S68/S85/S87 – ensuring perfect fit and function.
• Durable Brass Construction for Longevity: Engineered with heavy-duty brass, this 24V AC solenoid valve resists corrosion and withstands constant water pressure. Built to the reliable standards expected for Aprilaire humidifier valve solenoid replacements and similar demanding HVAC applications.
• Efficient Humidity Control: The Apri-laire solenoid valve is designed to provide precise control over your humidifier’s functionality. 4040 humidifier water solenoid valve controls the amount of water entering your humidifier and helps you maintain the optimal indoor humidity of 35%-45% at all times. When the indoor air is dry, the 4040 humidifier solenoid valve can control the circulating humidity of the humidifier. Enjoy increased comfort with reliable moisture management.
• 24V AC Power, Universal Compatibility: Designed to work flawlessly with standard 24V AC control systems found in residential and light commercial humidifiers (like Aprilaire and compatible units). Restore precise water control efficiently and safely.
• Restore Peak Performance & Protect Your Investment: Don’t settle for downtime or inconsistent humidity. This high-quality, OEM-spec solenoid valve delivers reliable operation, ensuring your Aprilaire 400/500/600/700 or 4040 humidifier performs optimally, protecting your system and your comfort.

Specifications