07/20/2026
What Exactly Is a Seacock?
A seacock is simply a valve (preferably high-quality bronze or engineered marine composite) that controls any opening below the waterline. It allows seawater to enter or leave your boat for systems like engine cooling, sinks, toilets, and air conditioning.
One of the most important maintenance jobs on your boat is to operate every seacock several times a season. If it sits untouched for years, you may find it seized when you need it most.
A good rule of thumb:
✔ Open it.
✔ Close it.
✔ Every Month.
A seacock that cannot be operated quickly in an emergency offers no protection to the vessel. Regular movement distributes lubrication and clears out salt crystals. If a valve becomes stiff, never force it—this can snap the handle or stem.
QUESTION: DO YOU LEAVE YOUR SEACOCKS OPEN OR DO YOU CLOSE THEM EVERY TIME YOU LEAVE YOUR BOAT?
Let us know in the comments!
And remember: Everett Yachts - People First, Always.