AprilAire 4403 Scale Control Insert for Humidifier Model 400

BENEFITS: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 (sold separately).Also see 4788 Maintenance Kit for all maintenance parts in one kit.INCLUDED IN THE BOX:(1) 4403 Scale Control InsertSPECIFICATIONS: Compatible Models: 400, 400A, 400K, 400M, 400MK, 400MZ, 400Z, 400KZ, 400MKZ, 4788 Materials: Polypropylene Actual Measurements: 14H x 10.8W x 4.9D (inches)