We need more information to answer your question.What is the best practice with seacocks, open or closed when leaving the boat for a number of days?
Which is why cockpit drains should exit above the waterline. They don't on a lot of boats but that's one of many common design defects.Except, of course, the cockpit drain seacocks (if applicable). Don't want the cockpit to be a puddle.
Hmm.... that's a bit unclear to me, Hermit...I am waiting unitl I get insurance before I leave mine open when I go home.
As Roger said you have to drain the oil out of the engine before leaving them open while you are away.
It's to avoid the oil slick and pollution fines when the boat sinks. Don't forget to empty the fuel tank as well, Hermit.Hmm.... that's a bit unclear to me, Hermit...