Jsbr,Sorry it took me so long to post. I will get the details written up and show some pics of mine.The cool factor is that depending on how high the side of your boat is ( can recirculate existing water or have constant flow from lake or river that you are in while in boat ) the overflow can be made to a specific boat.all you need is a bilge pump, ( mine is a 750 g.p.h. rocks on with the water) 25 gallon plastic barrel, some pvc or cpvc pipe,couple of valves .few fittings. small piece of plywood, and some hinge handle hardware.I make mine portableand use insulation to keep them shad critters alive pretty tough bait fish to keep alive.Did you know you can't keep shad alive in a square cooler? They are always moving and beat their nose up in the corners and it kills them.