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 direct exhaust of {HEAD ~ volatilized gasoline} into {TAIL ~ the atmosphere}, and accurate judgment can be made as to whether the fuel tank cover is adequately tightened 
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 direct exhaust of { HEAD ~ volatilized gasoline } into { TAIL ~ the atmosphere } , and accurate judgment can be made as to whether the fuel tank cover is adequately tightened
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