Stack your pipe for maximum diffusion. The STAX collection from Grav Labs is the first modular water pipe series available on the market. That means you can tailor your pipe yourself, for a personal fit. Add percolation, dial in airflow, and build your bong as tall as you want. All with the same quality glass you expect from Grav Labs.  This perc section will add a new chamber to watch your smoke build. Smoke makes it's way through a ring with several down facing cuts. Not a lot of filtration, but you are not losing any cooling power. A low water line allows plenty of space to let your smoke build!