Aprilaire 4040
Aprilaire Humidifier Solenoid Valve 24v used in 400 500 600 700 Series
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Aprilaire model 4040 replacement solenoid. Genuine Aprilaire solenoid for model 220, 224, 440, 550, 558, 560, 568, 600, 700, 760, 768. Includes the strainerĀ 4004, installed in valve body.

Specifications printed on solenoid body: 24 volts, 60 Hz, Orifice (3/32 - 3/64).

Both the inlet and outlet are threaded 7/16"-24 UNS for accepting a compression fitting for Ā¼" tubing. The inlet includes the compression fitting & ferrule. For the outlet, your existing compression fitting is reused.

Aprilaire In-Line Strainer & Orifice

Aprilaire Flow-Thru humidifiers have a solenoid with a small strainer filter in the body. These strainers should be inspected and cleaned when replacing the water panel. If the strainer becomes clogged the water pressure will tear it and pieces will jam the solenoid or loose pieces will block the orifice.

Aprilaire 24 Volt Solenoid
Aprilaire 4004 InLine Strainer Aprilaire 4231 Yellow Orifice

Aprilaire 4040 & Generic 4040 Comparison

Shown below is the Covna brand 4040 versus the Aprilaire 4040. They are manufactured the same wth similar quality standards.

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