Boat Lesson: Thru-hulls are holes in the hull of your boat - some are above water and some are below water. Why do you want holes in the hull of your boat? Well, the connect your sink drain, your toilet, your blige pumps, etc to the ourside world. If the hole is below water it is standard practtice to have a seacock mounted on the thru-hull. A seacock is a simple on/off valve. The valve should easily turn off in the case of a hose rupture so that you don't sink your boat.
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