The Zeus Arc GT Flow Sink screen is a normal wear and tear part and should be replaced when it is time to clean your Zeus Arc GT. Old and deformed Zeus Arc GT Flow Sink screens should not be placed back into the unit. This pack of 5 Flow Sink Screens is identical to the Flow Sink screen that came with your Zeus Arc GT and is a perfect replacement when yours needs replacing. For best results with your Zeus Arc vaporizer, we recommend replacing your flow sink screens as soon as there's a sharp drop in flavor or airflow performance on your device.