I have a good elbow from pic-a-part. Alas, it is much smaller than the hole in the picture, thus the need for the seal ring. The elbow is ribbed. Will the seal ring push out once the elbow is pushed in?

MXFrank, what is RTV?

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1988 300 TE - Schnitzel (Daily Driver)
1995 E300 - Betty (Son's Daily Driver)

1987 300 TD - Kraut (Dropped a valve)

1987 300 D - Hans (Need to rebuild engine)