Chuck, it's called garboard plug. See this discussion, limited information: [url]http://c34.org/bbs/index.php/topic,663.0.html[/url]

This is the only one I've heard of in 13 years on this, and many other message boards.

One solution would be to just put antifreeze in the bilge. Easy for me to say, we don't pull our boat for the winter and it rarely if ever freezes around here.:)

Chuck, After having to remove water and ice from the bilge every 30 days during the winter, I drilled a 1/4" hole in the bilge center section. Sealed the walls of the hole with epoxy . Before launch, I screw a 1 1/4 " SS round head bolt in the hole with ss backup washers and two 1/8" thick neoprene fawcet washers against the inside and outside glass surfaces. The hole is small enough that I actually screw the bolt in the hole. In addition,I put locktite on the threads and use a ss lock washer when installing the plug.
Last winter I never accumulated more than 4 " of ice/water in the bilge.Saved me 3 six hour trips to the boat last year.

Jack F Stewart
1993 C36 #1233 "Windancer"
Port Clinton, OH

Speaking of Bildges, I read this in the Ensign Magazine. To determine if the water in your bildge is fresh or salt spit into it. If the saliva disperses quickly, the water is salt. If it hangs together it is fresh.

Chuck, I don't exactly understand your question? The 1/8" pilot hole is first drilled from the bilge side, about 1/2" off the bilge bottom . I had to use a motor driven flexible cable with a bit on the end to keep the hole horizontal. You then can go outside and drill the the 1/4" hole. This way the hole remains about 2" above the keel/fiberglass interface.

Jack F Stewart
1993 C36 #1233 "Windancer"
Port Clinton, OH

Chuck,

You didn't say whether you had an in-mast main or not. I had the same problem for several years until this winter. All I did was to plug up the top and bottom cavity of the main with plastic trash bags. About 4-6. For the first time, I have no water coming in during the off season.