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Aprilaire Genuine OEM Scale Control Insert 4640 for Model 500
Item # PCP4640
$19.95
MSRP: $24.95
Availability: In Stock!
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This is the u-shaped component which encases the Water Panel. It directs any built-up mineral deposits back into the water panel and it prevents water from leaving the wet-pack section and entering another portion of the humidifier. Fits model 500. 
This Product fits the following Models:
Aprilaire: 500.
MPN: 4640

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