Found this on Amazon, just purchased, thought others may be interested. Be aware, most 6" PVC is not 6"ID, usually slightly less.
I intend to use this in a test of the inline separator per my comments on Phil's thread - "An inline separator idea (http://www.jpthien.com/smf/index.php?topic=1196.0)".
Others may wish to use it for other reasons. It is the cheapest I have found so thought I'd throw it out since a lot of others use "6 inch" PVC for other items such as runs.
I do not represent/work or am in any other way associated or have any vested interest in this item other than stated.
http://www.amazon.com/gp/product/B009H4N4DU?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00
Spears P309 Series PVC DWV Pipe Fitting, 1/4 Bend, Long Sweep Elbow, 6" Hub x 6" Spigot