What does a carb hole do?

Much like a car’s carburetor, the operating the carb hole mixes air with fuel, which in this case is dry herb. The carb is a small hole on the side of a hand pipe or bong that when closed allows the herb to burn and when opened lets you to clear the bowl. You simply use your thumb to operate how much cannabis you burn before taking a hit.  

Photo: Flickr

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