I'm new to sport boats and bought the Sea Ray version of a "wake boat" and have a question...since I got no owner's manual. Under the passenger seat behind the windshield there is a Y splitter that has a single hose running through bottom of hull and two hoses running to the front of the boat...unknown end location. I can turn off either line using the valve. What do these lines run to? The bow seat storage is completely open for ski storage so there's no cooler boxes to drain. Is there a water ballast in bow that these lines feed?