My main concern with my boat is that I still have the original trough along the transom. I think this is going to cause me to have my 1.5 drainline too low and the livewell might not drain properly while the boat is at rest. Also, my tank has 2 drains, a 1.5 drain towards the top which is an "overflow" and then the "end of day" drain which looks to be 3/4" at the bottom side of the tank.