what is the green top thing near the cover that has 2.0 engine in a 2000 beetle on 2000 Volkswagen Beetle

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its a green little top i know where the water goes the fluid for wipers and i think the oil but idk what that green top is
(1) Answer
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LEAVE IT ALONE; That is a port to use while checking your EVAP system. Leave it tight and don't mess with it.
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