OK...after looking at the instructions again, I get it. I see what the circle that is labeled "ESC" is supposed to be. From what I can tell via the diagram, it looks like the male prong on the back of the pump is the negative pole, and the female receptacle is the positive. Do I have that correct?

BTW, I am looking forward to getting the system up and running. I have heard nothing but good stuff about Tam's system.