I have a leak in my live well plumbing. Specifically, its the O-ring around my cartridge pump. Until I replace the live well pump, my plan is to insert a plug on the outside of the boat (where the water intake is located). The water intake port appears to be 5/8", and it appears to be threaded on the inside. I've seen 5/8" live well plugs, but they're smooth on the outside, like they're intended to be used inside the actual live well. Does anyone know if these plugs can also be used on the water intake? is there a different plug to be used? Thanks!