![Portable Gravity bong setup. Cut the bottom off of a glass bottle and then glued a 14mm to 18mm expander to fit the bowl. : r/StonerEngineering Portable Gravity bong setup. Cut the bottom off of a glass bottle and then glued a 14mm to 18mm expander to fit the bowl. : r/StonerEngineering](https://preview.redd.it/0cy5a97e7or41.jpg?auto=webp&s=f4256955ba901f23cf737dda0b926e9ab7e4a747)
Portable Gravity bong setup. Cut the bottom off of a glass bottle and then glued a 14mm to 18mm expander to fit the bowl. : r/StonerEngineering
![So the idea is to cut the bottom off the glass bottle and sand it, then put it inside the hydro for a gravity bong. Should work well, just wondering if it So the idea is to cut the bottom off the glass bottle and sand it, then put it inside the hydro for a gravity bong. Should work well, just wondering if it](https://preview.redd.it/xrdk6rpy0o751.jpg?width=640&crop=smart&auto=webp&s=df204a9ba7643323689718985ee6a4b0ebc878ca)
So the idea is to cut the bottom off the glass bottle and sand it, then put it inside the hydro for a gravity bong. Should work well, just wondering if it
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