Aprilaire Humidifier Maintenance Kit, for 500 series

Aprilaire 4792 Maintenance Kit with Water Panel 10 for Humidifier Model 500, 500A, and 500M. This genuine replacement water panel was designed and manufactured in the U.S.A. by Aprilaire – the leader in indoor air quality solutions, to optimize the performance of your Aprilaire Humidifier Model: 500, 500A, 500M PERFECT APRILAIRE FIT Water panel dimensions: 10" H x 9.75" L x 1.75" W Includes: Water Panel 10 Scale Control Insert 4640 Water Distribution Tray 4331 Feed Tube and Compression Sleeve 4335 Orifice 4231 Drain Spud 4223 Inline Strainer 4004 Owner's Manual For optimal performance, replace water panel annually.