They fatigue and eventually fail (especially if you trailer the boat or they get exposed to sunlight). If the thru-hull is below the water line the boat can sink if the sump pump(s) don't keep up. I've seen 2 boats go down in our marina due to a lack of paying attention to thru-hull fittings. Some manufacturers use brass which do not fail.
_________________ 2006 Four Winns 378 Vista 1999 Ciera 2655 5.7L BIII "Brenda Lou" 1996 Skeeter 1850DV 175 Mariner 9.9 Mariner. sold 1975 Lund 14' 25 HP Mercury. sold 2008 Dodge Ram 2500 4x4 6.7L Turbo diesel Quad Cab South Bay Marina, Green Bay
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