What does this pipe do? Its broken :(

I had a small knock yesterday and took out the driver side headlight. I've found a pipe that looks to have snapped off at the connection point to some kind of reservoir? In the picture you're looking down into the space that was filled by the driver side headlight. The green arrow points towards the snapped pipe. The red arrow points towards a fixed pipe that looks like its missing a flexi hose? Any idea what the pipes are for and how to fix it?



Cheers



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