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Clover recently dropped this rig for 2020. It has a water pre-filter leading to a diagonally-scored ball perc in the bottom, and here’s where things get interesting.
That ball perc feeds into several tubes which empty into the mouthpiece, but the chamber around the tubes houses the pre-filter we mentioned earlier, allowing the smoke to get water-cooled for a third time, after it has exited the ball perc. The design is super innovative and the sidecar mouthpiece makes this scientific rig look that much cooler.