Simple but effective, the Honey Bubble Carb Cap will boost vapor production with any banger. The bubble shape allows you to easily move the concentrates around the dish to boost your hits and to minimize waste. The single hole on top of the bubble gives you maximum airflow control. This premium carb cap is built with borosilicate glass for purity and durability you'll appreciate. Outer Diameter - 30mm Spout Diameter - 8mm