Carb-It - Adjustable Carb Cap - White Rhino Silicone

The bubble cap is a round piece with a straight little tube that is open at the end. The spinner cap is also round with a straight tube extended from the bottom, but instead of being open, it is covered with small holes all along the sides. These holes create the grooves of the Spinner, which in turn creates a vortex with the airflow on an inhale, which swirls around the entire banger.