Aprilaire Genuine OEM Scale Control Insert 4217 for Models: 550 & 558
Item # PCK550D
MSRP: $21.95
Availability: In Stock!

This is the u-shaped component which encases the Water Panel Evaporator. Their purpose is to direct any mineral which builds up back into the evaporative panel. They prevent water from leaving the evaporative section and entering another portion of the humidifier. This is used with the #10 pad and fits models 550 & 558. Also fits Lennox Model: WB2-12, WB212.

This Product fits the following Models:
Aprilaire: 550.
MPN: 4217

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