Hello, Guys. Thanks for the replies. After a closer look, and guessing at its weight, I will go with bronze. I like the idea of a bilge drain, but being a landlubber, and a city boy, I can't picture it in use. Here are pics of it dis-assembled, looks like the remains of a gasket, or, plumber's putty on the flat area. The tapped holes go all the way through the body. Regards, Lou