H2O | 21" Dual Percolator Glass BongGet ready for the smoothest hits with the H2O 21 inch Dual Percolator Glass Bong. Standing tall at 21 inches, this big glass perc bong is built to deliver the highest level of smoke filtration, thanks to its dual percolator design. The dual percolators make a huge noticeable difference and work together to break up the smoke into smaller, finer bubbles, providing increased surface area for cooling and filtration. Hits that are not only smoother but