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You are looking at a billet aluminum gas fill
Made to use with a 1 1/2" fill hose, can be modified to use a 2" fill hose pretty easily
This cap is vented so you would not need a separate fuel tank vent but the cap vent can be closed off with a simple set screw if your tank is already vented
Message me with any questions, I only have this one, Thanks
I have a couple other types of used fuel fills if your looking for something else