Wow, I never saw that website before, what a cool website. Also I NEVER saw someone make a gravity bong like that, OR use a 1/4" socket. That's awesome thanks for the vid. I'm gonna try using this sometime. Think it works as well as a traditional gravity bong? Hmm, I imagine a traditional one is where you have like a bucket of water, a 2 liter bottle with the bottom cut off, and you drill a hole in the cap and put a metal bowl piece in the hole and pack it. Start the bottle all the way down in the water and start lighting the bowl as you slowly lift the 2 liter bottle. Once filled with yellowish smoke or whatever, unscrew the bowl piece, push the bottle back down into the water which pushes the smoke out into your mouth.