This is the replacement lid for the Philips Respironics DreamStation Go Heated Humidifier. Remove the tank lid by pulling up on the tank lid tab while holding the tank base. Pour out any remaining water and rinse the tank base. Reassemble by aligning the tank lid with the tank base. Push down on the tank lid until the tab on the tank lid snaps securely over the hook on the tank base. When the tank lid is attached correctly there should be no gap between the tank lid and the tank base. Clean the tank lid and its components daily to prevent mold and bacteria growth. Use a mild liquid dishwashing detergent only (1 teaspoon of liquid dishwashing detergent per gallon of warm water). Do not wash the tank lid in a dishwasher. Hand wash only.