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The Aprilaire Float Assembly #4406 actually floats in the scale control insert/float chamber to control the supply of water in your humidifier. When the water level is high enough, the right hand float turns off the water supply. As the water evaporates and the float reaches the bottom, the electronic switch is activated. Compatible Models 400 400A 400M
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🇺🇸 Ship from USA · On Agora since 2026
$18.49