I was referring to the cover that has the small hole that the return pipe goes into. The cover is only on one side, but, yes there is an open area on the opposite side for the return pipe to fall in to.
I have the skimmer on a new tank right now (nothing in it but saltwater) and the bubble action rose overnight to spill water in the collection cup. The collection cup was at its lowest position and the airflow was at the 2 o'clock mark. The overflow pipe did it's job and returned the excess water back into the skimmer. So it worked for me. But I'll still keep an eye out, thanks.
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