I am thinking that Gulf Stream likes to make things interesting myself. I also have a AmeriLite but mine is even crazier then yours. My GRAY water tank valve is marked Sewage and the other valve is marked Gray WATER. So my first camping trip 3 weeks ago I dumped the one marked SEWAGE first and only had a trickle and I didn't see any thing go past the clear 45 hose window and then I hooked it to the other guess what ... yep sewage came pouring out good think they had some fresh water to wash out the hose .. lesson learned. ... now that I'm off topic ... my point is that Gulf Stream could mark things better wouldn't you think ???
Don