There have been several lengthy and detailed discussions of this subject in the past, and they can be found in the archives if one wants to use the search function.
We have eleven holes in the bottom of our boat, all of which have a seacock on them of course. We leave all seacocks closed at all times unless we anticipate using one or rmore when we have the boat out on a run or a cruise. These we open before we leave or when we actually need them, and we close them when we leave the boat to drive home.
The only exceptions are the seacocks for the main engines, which we leave open all the time. We do this in case someone needs to move the boat in an emergency as we live 100 miles away.
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