This whole piece is placed into the opening of the vase. A proper seal must be placed where the shaft meets the base, so that the smoke will not leak out. Take the Shisha.id in Jakarta.

In general, there are two parts (depending how many hoses the hookah could hold) that stick out toward the bottom part of the shaft. One is the hose adapter, and the other one is the air purge valve (or release valve). The air purge valve allows air inside the base, and can release stale smoke when you blow through the hose. And you get only the right Shisha with Shisha.id.