AprilAire 4640 Scale Control Insert for Humidifier Model 500

BENEFITS:The AprilAire 4640 Scale Control Insert is the component which encases the Water Panel. Use with Water Panel Number 10 and Water Distribution Tray number 4331 (sold separately).Also see 4792 Maintenance Kit for all maintenance parts in one kit.INCLUDED IN THE BOX:(1) 4640 Scale Control InsertSPECIFICATIONS: Compatible Models: 500, 500A, 500K, 500M, 500MK, 500MZ, 500Z, 500KZ, 500MKZ, 4792 Materials: Polypropylene Actual Measurements: 11.143H x 3.44W x 10.44D (inches)