I am new to sailing and I have a question about the self bailing system. The other day I started to launch my 23 Macgregor and I notice water coming in the drain on the floor in cockpit. Shouldn't there be a check valve to keep water flowing back in the boat? When the boat was on the trailer I wash it and the water ran out the drain hole just above the water line. Needless to say when I saw the water coming in the cockpit I pulled the boat back out of the water. Perhaps it was the angle of the boat because it was still on the trailer when the water started to come in. If anyone has any information I would apprecate it. Scottiv