Gordo Scientific - GTR Carb Cap (Clear)Introducing the GTR Cap, this innovative dual channel design merges the best of both worlds: the swirling agitation of a Gordo riptide cap and the focused airflow of a traditional bubble cap. The GTR Cap features two separate airflow channels with independent openings on the handle and the bubble. Simply cover one opening with your finger to activate either: Riptide channel: Creates a powerful vortex for even distribution of your concentrate.