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This is the Flip-Top Lid (Cover) with Seal that closes and covers the removable humidifier chamber used on all H4i Humidifiers as well as HumidAir 3i Heated Humidifiers.
Usage Information: When this Flip-Top Lid is used with H3i Heated Humidifiers it converts the humidifier so it will only work with H4i Heated Humidifier chambers.