Paul,
The part shown on that page was a Catch Can, which is not the same as an Oil Seperator. The one shown here is pricey, but it works very well at pulling the oil and other junk out of the air exiting the PCV valve.
http://www.accmachtech.com/catchcans.asp
David
that one you recommended says "catch can" too...it just has steel mesh and cuts in the housing? I'm getting confused...
what is meant by pressure drop?
The way the oil vapor is removed from the air is through a pressure drop. Going from small line to large can. The misconception is the steel wool filters the oil out of the air. That just isnt the case or how one of these things work.