The Aprilaire 4403 Scale Control is used with the number 45 water panel and 4407 water distribution tray
The Aprilaire 4403 Scale Control is used with the number 45 water panel and 4407 water distribution tray
The Aprilaire 4403 Scale Control is used with the number 45 water panel and 4407 water distribution tray
The Aprilaire 4403 Scale Control is used with the number 45 water panel and 4407 water distribution tray

AprilAire 4403 Scale Control Insert for Humidifier Model 400

$22.75

The AprilAire 4403 Scale Control Insert is the U-shaped component which encases the Water Panel. Use with Water Panel Number 45 and Water Distribution Tray number 4407 — both sold separately. All parts mentioned above are included in the number 4788 Maintenance Kit.