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Its a vaccum line. All three connections on that tee fitting should go to a vaccum line, which will have one vaccum source and two accessories that it goes to. It can be emissions equipment, etc. Probably just vibrated loose or popped off when something kicked up. Either way, you need to get it reconnected. You can tell if it goes to the vaccum source by putting you finger over it while running and seeing if there is suction. If there is, you should probably cap it off until you get it connected properly.
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