Uses pre-existing compression fitting on the outlet side. Electrically operated and uses 24 volts and 2.3 watts. The humidifier valve includes compression nut, washer and strainer. This valve is comparable to part # 4040 Fits models 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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