ORIGINAL: mikeboyd
If you have a fancy, cowled airplane, you can run two clunks and buy a fancy metal plug and metal ferrule assembly (Hangar 9 has a nice kit) to go through the side of the plane or the cowl.
Say what? Two clunks? The 3 line setups I run only use 1 clunk. The fueling line is a solid tube to one of the front corners of the tank. BTW, the fancy metal plug thing is commonly called a fuel dot.
Great Planes sells a refueler valve assemble with a special nozzle also, but many are worried about complicating the fuel inlet process with that set up.
I've been using the Dubro fueler on a couple planes for a while now. So far, they are fine.