Gas cap gasket

[Boatcarpenter]

My friend has an M38 and an M151 and says that splash back from a full tank of gas with ethanol has turned the old gaskets to mush. Anyone know of a source for an upgraded gasket that is ethanol proof? A cork one would work but might dry out rapidly due to infrequent use possibly?
Thanks,
BC

 

[Boatcarpenter]

Thank you. We will see if we can locate some.
BC

 

[quickfarms]

go with the cork one

mine is about 4 years old and still looks and feels new