Keel - threaded hole

[Russell]

According to the Perko web site a list of spare parts include the plug being part number: Plug: 012400099B If you cannot find it somewhere cheaper it is available for $34.38 here: http://www.yachtsupplydepot.com/hardwar ... 63777.html
Maybe a plumbing supply or hardware store if it is not a unique part.

[Pitou]

... and a few bucks less from C.G. Edwards out of Boston. I've used them hear and there and there in the past for parts.

http://www.boxells.com/Perko/pko305-13.html

[Sisu22]

OK great - thanks for the help.