4040 Humidifier Water Solenoid Valve Replacement For Aprilaire Whole House Humidifier Series 400 400M 500 500M 600 600M 558 550A 550 568 560A 560 700 700M 768 760A 760 24 Volts 60 Hz Brass Solenoid Valve Direct Fit Easy Install
✔️ Single unit 24V brass solenoid valve for Series 400-700
This direct-fit brass valve replaces faulty 4040 water solenoids and is compatible with humidifier units in the 400-700 series, offering precise water control for consistent indoor humidity.
✅ Exact replacement for 4040 humidifier solenoid and 400-700 series units
✅ Durable brass construction for longevity and corrosion resistance
✅ Precisely controls water flow to help maintain 35%-45% RH indoor humidity
✅ Operates on standard 24V AC control systems for residential and light commercial use
✅ Direct-fit, easy install with common replacement part references like NO.100006735, A2012-S118, B2035-S2/S5/S54/S55, B2015-S51/S54/S58/S65/S68/S85/S87
💡 What is a water solenoid valve used for in humidifier systems?
In humidifiers it meters water into the unit to regulate moisture output.
- regulates water flow to maintain target humidity range 35-45% RH
- helps prevent over-humidification or dry spots in the space
- works with standard 24V AC control circuits in residential setups