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Source for Flop Tube O-Rings?

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NvertedAv8r

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I'm replacing my fuel tank flop tube and keeping the weight but the o-rings have become brittle.

Does anyone know of a source for the fat o-rings on the weight? or the correct o-ring material (fuel resistant is an obvious requirement)

by my best measuring and calculations they are:
3/16 thick
13/16 OD
1/2 ID

I have searched in this forum. I found some talk about the flop tube, weights, and even a mention of replacing the o-rings but no one mentioned a source. I believe Aviat will only sell the weight.
 

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