Aprilaire 10 Water Panel 4 Pack for Humidifier Models 110, 220, 500, 550, 558

Genuine Aprilaire Water Panel Replacement Made in Wisconsin, USA Fits Aprilaire Humidifier Models: 110, 220, 500, 550, 558 Optimizes humidity levels in your home. Helps reduce susceptibility to colds, the flu, and other respiratory ailments.