A carb is a hole in a hand pipe or bubbler that regulates airflow inside the pipe (as in a "carburater"). Typically, a smoker covers the carb with a finger while lighting the bowl. Then they uncover the carb as they inhale to pull fresh air into the pipe and clear the remaining smoke. Larger bubblers and water pipes don't require traditional carbs. Instead of covering and uncovering a carb, the component bowl in these pipes is removed after lighting the plant matter in order to create a carb-like opening and pull in fresh air.
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