Uses pre-existing compression fitting on the outlet side. Electrically operated and uses 24 volts and 2.3 watts. FITS MODELS: The 4040 solenoid valve B2015-S85 B2017-S85 is fit for April.aire 220, 224, 400, 400A, 400M, 440, 500, 500A, 500M, 550, 550A, 558, 560, 560A, 600, 600A, 600M, 700, 700A, 700M, 760 and 768.
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