EuroReef style skum cup connection.

I would love to know as well. I can tell you on my Lifereef the top 2 inches of the neck is slightly bigger than the neck itself. This allows the neck of the collection cup, which is the same size as the neck of the skimmer to sit inside this 2". Never had a leak, never a problem.

rich
 
You looking at the PVC union disconnect? You can get that at the specialty plumbing store. It's a Spears Union. It can run from $25-$50.
 
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