The tube is from those shipping places for sending paper work, I fill the soda can half full with water, the bowl is made from a cut up sode can (Just the sides) wrapped into a pipe like shape abd shoved in the cans side half way up, Then I found a tiny glass bottle and cut the bottom off to make the nowl itself. On the can I only cut of enough of the top so it would fit tight. I will let you know how it works out Thursday when I get my Purple Haze (yes that is a real and live strain). From the test run its works really good.