PCV valve grommet

My 97 Civic LX seems to be missing the grommet for the PCV valve. When I replaced it last week it just plugged directly into the intake manifold. I’m pretty sure it’s suppose to have a grommet, so am I wondering whether it’s absolutely necessary?

Some kind of air-tight seal is necessary…Perhaps an O-ring hidden in the PCV port??

Something like this.

http://www.rockauto.com/catalog/x,carcode,1168961,parttype,11785,a,www.google.com%2BSearch%2Bfor%2BMOTORMITE

Ed B.

Right. That’s what isn’t there. The fit seems pretty tight without it.