I know this is an old thread but I'll try it anyway. My release well (port side?) appears to be clogged. I don't want to just ram something down the drain not knowing how the system works. Can someone tell me if there is some kind of backflow in the line? The thru-hull doesn't have a flap and the well will hold 1" - 2" of water while at rest and it doesn't drain when I pull the boat.