Grav Gravitron 2.0 Medium 11" Gravity Bong

Grav is proud to introduce the latest version of the world's first all-glass gravity bong - the Gravitron 2.0. This updated model features thicker glass for increased durability, a new platinum-cured silicone grommet for a tighter seal, and an updated interior bottle design. The Gravitron 2.0 is also equipped with an 18mm female joint so you can use your own 18mm bowl pieces and other accessories. With its powerful new look and ergonomic flange grip, the Gravitron 2.0 is sure to become your new go-to gravity bong. How it Works. To use the 11" Gravitron, start by filling the outer base with 8" of water, which will hit just below the decal. Then place the bottle into the base, and load the included 12mm bowl. Place the bowl in the mouthpiece of the bottle, and as you light it slowly pull the bottle upward. The bottle will fill with smoke. When you're ready to hit it, remove the bowl and inhale through the mouthpiece of the bottle as you push it back down into the water. This will create a pressurized flow of smoke that will give you a huge hit in record time.