Gas Cap with internal flare seal
thingiverse
It's not perfect, but a much improved sealing mechanism without the use of a gasket. Original part was great; solid, superb knurling for grip. However, it was too deep to make a face seal without stacking gasket material. Gas would spill out of the threads. An internal flare lip was added, based on measurements from a Blitz gas can. Again. it isn't perfect, it takes a tight twist, but much improved. I'm ok with this can being moved around, or sitting in the back of my pickup.
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