I got some of Bruce's waterpipe and have really been enjoying playing with it. This is my third pen I have made from it. Screwed up on the CB just a little, but it's OK for a give-away. It is a slimline kit.
Blue is clean water. Green is sewer. Pink is reclaimed (as in it's on it's way the water plant). That's what I've learned anyhow, I'd get a second opinion, lol
I really appreciate all the nice comments. Like I said it is fun stuff to work with and you can also use the thin wall pipe (1/4") by gluing it together. The secret I found to getting it to stick together good is to wipe it good with acetone before glueing. This pen was made with ABS pipe, about 1/4" thick