I'm getting hauled soon so I will get a definitive answer to how many holes I have.
We have eleven holes below the waterline of our boat, each one with a nice big bronze seacock on it.* All the intake through-hulls have perforated bronze plates over them, the outflow through-hulls do not.
A trick I learned from the captain of a corporate yacht I was associated with a few years ago is to wrap the handle of each seacock in siver reflective tape.* This way you can find or see the position of the handle even if the boat's electrical system is out and your only source of light in the engine room or other spaces is a little flashlight.
-- Edited by Marin on Sunday 5th of December 2010 12:51:34 AM