ORIGINAL: geeter
also they have permenent fuel shut off clips that stay right on the fuel line. they cost about 1.99 at tower hobbies or LHS. these are plastic and just need to pinch them on or off. a real time saver ,not to mention engine saver. you can route the fuel line on the outside of the cowl if you have one
Yeah I've used them. They work quite well and prevent damage to the tubing.
I believe they were designed for Helis.