Thread: Marelon Seacock
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Old 05-14-2019, 09:19 AM   #11
DavidM
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City: Litchfield, Ct
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OK, that makes sense. Marelon is a good choice for an aluminum boat. But lets talk about thru hull valves freezing, mostly from a theoretical perspective but with a bit of practical experience thrown in:


Thruhull valves with a ball pocket full of water can only freeze and burst if they get cold enough, duh!! They can get cold enough if the inside temp of the boat surrounding the thru hull is low enough or the water below it is frozen.


In Virginia it is very unlikely that the water will freeze 1-2" thick. The outer thru hull mushroom will always be in liquid water which will be above he freezing point of the water in the ball pocket. In my experience in Oriental, NC the air temp inside the bilge will be above the freezing point. In Virginia to be safe I would keep a small bilge heater going in the coldest of days to be sure that it doesn't get down to freezing.


David
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