How about drilling a hole and putting a piece of copper pipe in. You could close the pipe with a rubber stopper.

> I put bulkheads into my Tred Avon, with storage in the hull. The idea was
> to get watertight flotation compartments, with no hatches on deck. I put
> 4" deck plates into the bulkheads to allow them to breathe and dry.
> But, I put the access hatched about 1-1/2" above the keel, and water
> got in there. It either leaked around the access hatches, or condensed.
> Leaked I think, we were doing wet reentries. The water is difficult to
> remove, it will not run out because the access is too high. I can get most
> of it by tilting the hull as far as I can and shaking it, but still there
> is more left than will evaporate in a reasonable time. I can make an
> attachment for the shopvac to suck it out, but that wont work in the
> field. I'm happy with the arrangement, but if you are considering it, put
> the access ports as low as they will go...