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It's the AIR hose that goes into the hole in the bottom of the filter. There should be a plastic fitting on the end of that hose with a lip on it that will require a decent amount of force to push into or pull out of the filter. Seeing as you don't remember disconnecting the hose I'm guessing that fitting is missing? If it is it's probably still stuck to your stock air-box if you still have it.
If it's missing you can just shove the hose into the filter and duct tape it until you get new fitting or universal grommet from your favorite parts store...
Last edited by cdkcorvette7; May 17, 2012 at 05:33 PM.
Reason: typo