Thank you. I don't think I have any O-Rings... when I hold that little plastic collar down and slide the vacuum 90* hose end out, I can look down in the hole and see the end of that plastic retaining collar and then the machined aluminum intake manifold hole... I don't see anything else. I'll look closer when I get home from the office today, but I think that's probably the piece that I'm missing then. I can jiggle those lines all around when they are seated "properly". Does the new brass piece come with the O-rings and everything I need to fix this?