Our most recent creation “Glass Gravity Bong” : r/StonerEngineering
Ghetto gravity bong using a 1/4" socket as the bowl, and a garden hose nozzle as the holder : r/StonerEngineering
The Perfect "Percolating" Gravity Bong : r/trees
My homemade glass gravity bong. : r/StonerEngineering
Does this waterfall bong waste a lot of weed compared to a normal pipe or is it more efficient? : r/saplings
The College Student's Gravity Bong (<$10) : r/StonerEngineering
Homemade gravity bong : r/CTblaze
The first rip out of the new gravity bong we made [10] : r/trees
Look at what genius idea my room mate had for putting ice in the grav bongs. Everybody should try this, it's soooo smooth. On the left is Clark (my roommates) and on
Water Filtered gravity bong failed attempt #1. Anyone else care to give it a try? Detail in comments. : r/StonerEngineering
Glass gravity bong : r/StonerEngineering
Whatdya guys think of my gravity bong?? : r/StonerEngineering
Making a simple waterfall bong with a bottle and the herb simply won't light : r/StonerEngineering