Re: port holes?
These holes are way above the water line. You will find them in almost every boat out there. Installed right, they should cause no problems. Make sure the fittings are sealed with 3M 4200 so no water can seep in. If you want to scure the heck out of it, use anti siphon valve on your hoses. This will allows the water to travel in only one direction (from inside the boat to outside only) and stop it from traveling into the other direction.