Sailors, My M-17 had the cockpit drain exiting the hull through a radiator hose to what I think I have read is an aluminum through hull pipe that it molded into the hull beneath the water line. I have been reading all of Don Casey's books lately and took note of his advice that all through hull holes have sea cocks. I know that I have looked at one M-17 on the photo site that has had corrosion problems and replaced the aluminum(?) pipe but I do not know the longevity of this hole in the hull. I have one of the very early M-17's vintage 1975. My question is how much should I be worried about this pipe/through hull arrangement? I keep my boat in the water (salt water) during the season and would hate to have it sink. A better question is has anyone replaced the pipe with a more traditional through hull and sea cock valve? Thanks Robbin Hull #056 Miss Take, sailing out of Breezy Point MD PS having my steel board blasted this week and coated with 2000e. Just finished my last ski trip so it should be sailing season now, right?