Ailin

Hey, there's a small leak in my boat that is similar to a pond prowler. It fills the hull up with water, with the amount of water that drained out, I came with an estimate of about 3 quarts of water an hour when it's in the water. Any idea where it might have come from and how to fix it? I have two drain plugs that sit below the water, the plugs don't exactly fit tight with the hole though, do you think it is because of the drain plug?