Found this today near batter tray, running parallel with rain tube. I'm assuming it's not the hose that comes out of the charcoal canister as I already have one connected there. Or if there are two clear hoses in this area, what is the other for? Thanks!

Battery fume vent for sealed top battery?

Isn't that for the beer keg in the trunk?

Any other thoughts???

Not OEM..

You see them on motorcycles a lot. To keep the acid from eating the tray and frame. They ran a tube down below everything. Imagine some company running a tube to safely channel the acid fumes and spill down under the vehicle away from the metal.