Quick question on fuel tank

[BamaDrifter64]

When I last pulled my fuel tank to swap out a new petcock, the vent line would not come off and in trying to remove it, pulled it up pretty high from the frame.  The other end was loose and I saw a t-connector with one side available.  Does the bottom end of the vent line attach there or does it remain loose low in the frame?  Thanks!

Dave

[tank_post142]

it hags loose, the t is to prevent vacuum lock and is left open