On Mon, 13 Oct 2003 23:34:10 -0400, something compelled "Bruce"
, to say:

Steve, Sounds like you yours was a Mk2 which I would prefer if I had another
choice. I was thinking of just using a small thru hull fitting a couple of
inches above the water line with some type of check valve. Thanks for the
reply.
Bruce

I guess that would work, although for the thru hull I'd recommend
a valve that you can shut.

Faced with the unknown such as you are, you might just drill a
small hole into the space and see what's in there. Solder a
couple of wires to a flashlight bulb, put it into the hole you've
made, and look around.