AprilAire 4839, Maintenance Kit For Whole-House HumidifierCondition:* New Surplus Stock, In Open OEM Packaging. As Pictured.Additional Notes:* This genuine replacement water panel was designed and manufactured in the USA by AprilAire* No need to find the parts yourself! This kit contains all components required to maintain peak performance of your AprilAire Whole Home Humidifier and make it like new.* Genuine AprilAire designed for peak performance of your whole-house humidifier* AprilAire Humidifiers can help you maintain optimal humidity in your home of 40% 60% which has been shown to reduce the incidence of respiratory infections and symptoms related to allergies and asthma by minimizing the formation of bacteria and viruses, fungi, and dust mites. * Compatible Models: 600, 600A, 600K, 600M, 600MK, 600MZ, 600ZAprilAire 4839