Aprilaire Maintenance Kit for 500, 500A, & 500M

Aprilaire Humidifier Maintenance Kit 4792 includes everything you need to keep your Aprilaire Humidifier 500, 500A and 500M operating like new. Ensure peak performance for years to come. Includes: # 10 - Water Panel # 4640 - Scale Control Insert # 4223 - Drain Spud # 4231 - Yellow Orifice # 4335 - Water Feed Tube # 4331 - Distribution Tray # 4004 - In-Line Strainer Printed Owners Manual