5" Upline Basic BubblerAt 5 inches tall the Upline Basic Bubbler from Grav Labs' Upline range packs a lot of features into a compact package. The decent sized bowl is recessed into the top of the bubbler chamber and the smoke then travels down a downstem which has diffuser holes at the bottom. Once through there your smoke has to make it's way through a trio of forced stacked percs which help to cool and filter your smoke. There are then two more restrictions just before