My overfow is below the water line and it seems to work just fine. I like no extra noise also so I designed it into my boat. I think you need to lose the external pump for the live well and get a drill with the right size hole saw and go for it. I bought some clear silcon from Home Depot that was designed to help weatherproof window and doors and I haven't had a leak yet. No overflow problems when I'm running at a blistering 8-9 mph :o