A downstem is a tube that carries smoke or vapor from the bowl of a bong or bubbler into the water. Some downstems are fixed inside the pipe to prevent damage. Others are made with standardized joints and can be removed for easy cleaning. Most downstems feature some kind of cut or perc at their water end, designed to make the smoke bubble more in the water. The more bubbling, the cleaner and cooler the hit will be.
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