I plan to replace the cockpit drain hose this spring. It is the corrigated plastic variety and since it drains just below the water line, I'm worrried. I wonder why so low when it seems thay could have gone a couple inche higher just above waterline. The plastic through the hull fitting is sound and doesn't leak so I'm not planning to replace it. (though I wish it was valved). Any suggestions on what to use and should some sealant be used?thanks John