A bubbler is a small water pipe that can be operated with only one hand (aside from having to provide an ignition source). In these devices the stem is internal and the bowl is at the very top. A majority of the bong is enclosed with only a hole in the side to act as the carb and the hole the smoke will exit on its way to the operator. These operate very much like a pipe since their internal chamber is so small but they have identical parts to a common bong. Some find them more pleasant to smoke out of than a regular pipe.
