I am working on a Carbon fiber 360 with fuel out to the tips. In the standard wing tips I have hidden a couple of antennas. I need to incorporate  check valves in the tips for the fuel vents but have been told  not to use the Andair check valve (metallic) because it might interfere with the antennas. Is there anyone who has found a non metallic check valve that would work in this application? There is even less room than in the 360 tips than the LIV. It was suggested that the ultra light guys could help me but apparently not many even know what a check valve is for.

Mark Quinn
Spruce Creek Fly - In
Daytona Beach