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

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

by in San Antonio, TX on March 13, 2014
1 answer
ANSWER by on March 13, 2014
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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