This long life "cleanable" humidifier water chamber (with a clear tub) will last for 2-years on average with proper care and maintance. It is compatible with all H4i Heated Humidifiers as well as HumidAire 3i (H3i) Heated Humidifiers that have been upgraded using the H4i Flip-Top Lid with Seal (Part 26953) or the H3i-to-H4i Upgrade Kit.