This is an Aprilaire 4331 Humidifier Water Distribution Tray replacement for use in conjunction with the Aprilaire Water Panel Evaporator and the Aprilaire Scale Control Insert in the following Aprilaire 500 Series and Aprilaire 600 Series humidifiers: Aprilaire 550A, Aprilaire 550M Humidifier, Aprilaire 600 Humidifier, Aprilaire 600A Humidifier, and the Aprilaire 600M Humidifier.
The Aprilaire 4331 water tray distributes water evenly to all portions of the Aprilaire 500 water panel evaporator which ensures the efficiency, longevity, and proper functioning of your Aprilaire humidifier.
Aprilaire: 550A, 550M, 600, 600A, 600M