I just bought a 19.5 foot 1997 Sea Nymph. I can't locate a model number. It's essentially a fish and ski with a single live well up front on the port side and a 115hp. My question is about the intakes on the back of the boat. I see there are 2 of them, on either side of the drain plug. One is black, one is white. I assume one is to take fresh water in and the other is to pump it out?? Am I correct? If so, can I plug these since I will probably never use the live well?