The present utility model is advantageous in that it has a delicate structural design, it is easy to assemble, its cost is low, it can effectively prevent {HEAD ~ direct exhaust} of {TAIL ~ volatilized gasoline} into the atmosphere, and accurate judgment can be made as to whether the fuel tank cover is adequately tightened 
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The present utility model is advantageous in that it has a delicate structural design , it is easy to assemble , its cost is low , it can effectively prevent { HEAD ~ direct exhaust } of { TAIL ~ volatilized gasoline } into the atmosphere , and accurate judgment can be made as to whether the fuel tank cover is adequately tightened
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