I can't see the picture that you're talking about but I have always fed my bees with a gallon jar inverted over the inner cover oval hole. If you fill the jar all of the way up, it takes very little to create a suction that prevents the syrup from dripping. Place the jar over the hole, put an empty deep around it, place a telescoping top cover on top, and a brick or two. Presto! No robbing and no rain. To check to see how much they are consuming, just lift the tele-top!