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Filler neck grommet?

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NDTOO

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I saw a couple planes at Oshkosh that had nice rubber grommets sealing up the fuel tank filler necks at the fuselage skin. I've searched Spruce, Wicks etc. but no joy. I did find a universal fit (2-2 1/2") that may work but thought I may just be missing them from the plane vendors. My necks measure right at 2 3/8".

The one in the picture almost looks like it is part of the cap. It was hard to tell and I forgot to ask the owner.

P8010184 (1024x768).jpg
 

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