Thanks for the replies so far - I love you can get answers so fast!
There was another thread on this a few days ago that included photos of people's holes.
Depends on the boat. Mine is just a simple hole.
I read that thread (I searched the forum back through early 2009). All the threads talk about/show the outside hole, but none mentioned the inside.
I am very interested in learning if it is just a simple hole. Sounds like yours is.
When you say "depends on the boat"... does anyone know of boats that use some water control on the inside of the hole?
If so, why? If no one does - this must not be an issue?
One scenario I was thinking of we beating to wind, hole is dipping under the waves as you go down.... it goes underwater until you come back up.
The alternatives didn't make much sense, though.
You would think a 1-way valve could get plugged from the muck your anchor can drag in. If there was a ball valve on the inside, you would think the "drain" would now be too high. Plus, maybe underneath 300 feet of chain.