I used to have a glass downtube, but the cats managed to knock the entire bucket of water over. We're talking 5 gallons, and a 10lb (if that?) cat. Needless to say, the downtube when 'shatter'.

So now I use a copper tube. If you look carefully in the video, he has a copper tube as well. There was a link to a "How to Build It" step by step.. But I can't find it. It's probably somewhere on the video link.

Eh.. The smoke isn't too bad with copper. Not as good as with glass, but it does the trick.
TheBlazeofGlory Reviewed by TheBlazeofGlory on . Falling back in love with my gravity bong. For a while threre i had stopped using my GB all together, but last week i busted that thing back out. I like to use it, but before it got to where it was like the only thing i would smoke out of if i was home. Anyways i am really stoned from the two gravity bong hits that i just pulled. Does anyone have a good design for a gravity bong, right now mines like a gravity bong with a tubed running down into the water so it filters it through the water, works kind of like a waterfall, but i am Rating: 5