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That is your power steering return line (9) connecting to the cooler tube (18) that runs in front just behind the front grill. You need one of those plastic push-in tools to release the tabs to separate it. I have not had to deal with mine, but these fittings are usually sealed with a single or double o-ring. Finding the perfect sized replacement o-ring is a crap-shoot. Removing the old o-rings and fitting new ones is also not the easiest thing to do. This is part of the low-pressure return circuit to the reservoir so you might be able to cut the factory fitting out and splice in a coupler with some worm gear clamps. This hose does not appear to be readily available.