18" Huge Straight Tube Bong With Dual Percolators18" Straight Tube Bong with Dual Percs Built Like a Skyscraper, Hits Like a Freight Train. Theres tall and then theres this. Standing a proud 18 inches, this huge straight tube bong with dual percolators isnt messing around. Built with powerful double stacked percs, every pull gets twice the cooling and double the diffusion, turning harsh smoke into buttery clouds. The stemless base keeps things tight and sturdy, while that wide 18mm joint leaves room