Aprilaire 4793 Maintenance Kit with Water Panel 10

Aprilaire Humidifier Maintenance Kit 4793 includes everything required for your Aprilaire Humidifier 550, 550A and 558 to continue operating at its peak efficiency. What's Included 10 - Water Panel 4004 - Inline Strainer 4231 - Yellow Orifice 4223 - Drain Spud 4226 - Water Feed Tube 4217 - Scale Control Insert 4218 - Distribution Tray User Manual