GRAV® Wedge Bubbler Rig - ClearGRAV Wedge Bubbler Rig Clear The GRAV Wedge Bubbler Rig is a sleek and ergonomic piece designed to provide maximum comfort and convenience for an exceptional smoking experience. Key Features: Low water line for exceptional flavor: The design allows for a low water level, enhancing the flavor of your material. Dense 3mm borosilicate glass: Ensures durability and reliability. Great for quick dabs and smaller hits: Perfect for those who prefer quick,