I recently bought a very old(1969) 15 ft. Texas trihull, my first power boat, and I'm about to get the engine problems worked out. However I can't figure the bottom of the hull out. <br /><br />Back at the transom the drain plug sits in a lower area of the boat than the floor, and there are two other drain plugs in the sides from the floor that are live well type plugs. I pulled those plugs and enough water drained into the basin to exit through the main drain plug.<br /><br />Does this just make sure that if the hull is leaking that no more will come in past those small drain plugs? I'm really confused.<br /><br />Thanks for any and all help...