Has your original lid for your H4i Heated Humidifier been lost or damaged? You're in luck: this flip-top lid will replace your previous one and allow you to keep your humidifier running smoothly. Also included with the flip-top lid is a high quality replacement seal: this silicone seal is located at the bottom of the cap and will help keep water in your humidifier.
The flip-top lid piece is designed to work with all H4i Heated Humidifiers. However, it can also replace the original lid for HumidAire H3i Humidifiers as well. If you decide to replace your original lid for the HumidAire H3i with this flip-top lid, it will then be compatible with H4i water chambers, but it will cease to work with HumidAire H3i water chambers.