I have a 1988 Hunter 35, but I think this problem may apply to other Hunters as well. Two weeks ago my Marina called to say my bilge pump was cycling every few minutes, so I dropped everything and went down to the boat. I needed an emergency haul out because the galley sink thru hull had failed. The threaded part of the thru hull had pulled away from the flange. Based on the look of the crack and the fact it was obviously not recent, I think the break happened a long time ago, but it took until now for the bedding compound to slowly ease its grip on the threads. The boat has a hull liner at that spot, and what appears to have happened is when the boat was built, the through hull was tightened down enough to help hold the liner to the hull skin. There is now about a half inch gap between the hull and liner. When I tried to replace the thru hull I couldn't get enough thread to show to put the ball cock back on. I solved the problem by using a hole saw to cut through the liner, so now the thru hull is tightened down to the hull directly (still with a backing donut of course). Suggestion: Next time you haul your boat, check each thru hull fitting, at least from the outside, for cracks. I'd like to hear comments, and whether anyone else has had a similar problem. By the way, the fitting was marlon, but I'm not convinced a brass fitting would have faired any better under these conditions.