For you guys who run diesels, gas, or alky fuel, Sullivan has a new fuel tubing called ProFlex that is imperious to everything, I just got some to check it out, and it is thinner walled and sticks like glue to 1/8" tubing. It bends tight without collapsing, and is very tough and heat resistant. Very flexible. The only down side is it is yellow and not translucent.

I got it to replace the Tygon tubing I have been using as it gets brittle over time, and from others I have talked to this tubing stays flexible. I of course got it for gasoline fuel in my sparkers for which I have been using mostly Tygon