On Sat, 23 Aug 2003 02:06:29 -0500, "Keith"
wrote:
You should be able to stick a coathanger or something through the open
thru-hull to knock out whatever's blocking it. I'm surprised it's so totally
"waterproof". Maybe you have a plastic bag stuck on the outside?
========================

Probably just barnacles and other marine growth. They can build an
amazingly efficient "plug" given enough time. I agree with the advice
to snake something through from the inside.