Chuck is correct. Check out the products labeled "Deck Iron":
http://www.go2marine.com/g2m/action/...egoryId/13891/

"Gould 0738" wrote in message
...
They make a special fitting for that.

You will wind up cutting a larger hole than the actual diameter of the
stove
pipe. The stove pipe will fit onto a central shaft in the fitting, and
there
will be an airspace between that central portion and the perimeter of the
fitting. You may also find a fitting stuffed with an insulating material
between the center and the perimeter.