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That line is just the vacuum source for the brake booster. Might be able to find the grommet at AutoZone, O'Rielly's, etc on the HELP or Dorman product lines.
Here's hoping the person who did your gaskets didn't crack that plastic fitting or the upper manifold. I usually pull the hose from the booster and just leave it connected to the upper intake.
It just rotates to come off, but why mess with it?
Here's the page from the GM parts book:
Last edited by oldeerslayer; 01-24-2018 at 09:38 PM.