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Need a thermos style fuel cap

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PowerStroke

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Oct 22, 2011
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Lost the fuel cap on my ultimate biplane fuel tank last week. Didn't have a measuring tape at the hangar so I assumed it was a 2" diameter and ordered one from spruce. Apparently, it's not. It looks like the fuel tank filler neck I.D. is 1.75". I've been looking online but can't find the correct size.

Anybody know where I can get a 1.75" thermos style pressure fuel cap?

Thanks
 

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