I'm trying to find a way to run the fuel lines through the frame without usimg the fuel line, anyone know of any fittings I can use so rubber line don't have to go through the frame, I'm looking at something 3\8" for a fitting.
When aircraft fuel lines go through a metal firewall (frame), a firewall fitting is used. it has a hex shape flange on one side to butt up against the firewall, and threads on the other side for a nut to tighten up against the other side of the firewall. each side of the fitting has a male flare, which connects to a female swivel on the end of a fuel hose.
here's a pic. there are a variety of styles and male ends. They come in straight, 90 degree, and 45 degree angles.
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http://www.rpmcat.com/images/E14-983203.jpg

