Join Date: Dec 2001
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As far as I know, they should all be closed when the boat is left unattended. As a matter of course, I only open the pet-cocks to systems needed while underway, and often will close them after using and shutting off the system. If the system will not be used immediately, the petcock is usually left closed.
BTW, I would replace any gate valves with petcocks, and the sooner the better.
~ Happy sails to you ~ _/) ~