in the post http://www.troublefreepool.com/caret...do-t25572.html close to the bottom there are pictures of opened skimmer. I am guessing that the plug is for the main drain? It has a stem pressing on which releases air. Can someone please confirm that this is in fact to the best of their knowledge a main drain plug? Second skimmer has a different plug which I assume is a permanent plug?
Thanks for looking and your help.