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Well they are called perculators. Since I am lazy, I will steal an explanation from Daego over on OG:
"A perculator or perc for short is basically an additional water chamber found in the main shaft of the bong tube, several comapnies use different designs but they all focus on more water to smoke interaction making for a better filtered and cooler hit. Some of the more well known comapnies take it a step farther by adding diffusors into their percs, which basically break the smoke up into smaller bubbles making a cooler smoke."
__________________ Good to be off probation. |