woah- why is this particularly an issue with clear tubing? I have a greywater system with some clear tubing, this did not occur to me either. I bought it only because that was all they had at the store I went to. Yes, very nice instructable. I really like how you tipped the barrels to take advantage of the built in threading- this is a particularly sore point with me, I would love to see an instructable on how to install leakproof spigots on a curved surface. I have a method, which I will soon be posting, but I'm still waiting to see if it holds- want to see what others have been trying.