Advance Auto has a Mr. Gasket valve cover grommet kit. It comes with two grommets, one is an open grommet. The other is a closed grommet. I bought two packages to get two closed grommets. Flipped the closed gasket upside down and slid it over intake tube. Added a zip tie to the groove in the grommet and tightened it down. Sealed, with parts that are designed to be on cars.
John