Black Leaf Recycle/Incycle Bubbler Keg PercoDelightfully small but very stable glass bubbler from Black Leaf with internal recycle function which is why it is also calles Incycler. In the process, the bong water is drawn through the internal tube into another chamber and then flows back into the main chamber. During the return flow, the water is enriched with fresh oxygen each time, therefore it is recycled. And at the same time, unwanted by products of the smoke settle on the pipe wall.