"Bruce" wrote in message
news
On Sat, 14 May 2011 14:33:25 -0500, "Dave"
wrote:

Does it look like a pipe plug? Maybe it is. If so try a hardware store
with a comprehensive plumbing department. DO NOT USE A BRASS OR
GALVANIZED PLUG IF IT SCREWS INTO AN ALUMINUM HOLE. Plain steel and
brass
both react with aluminum. Worse comes to worse you can make some out of
acetal delrin if you can determine the correct thread pitch and type.
Ok.
I could make some, or if you have a buddy who does machine work as a
hobby
he could make some.


Well.... I shopped and shopped and could not find what I needed.
I ended up drilling out the threads to fit a 5/8 compression plug.

The hole was sized for 3/8 plugs but had to use a 5/8 drill bit to get the
threads drilled out.


Thanks for the help tho.


That sounds very much like 3/8" pipe which has an O.D. of .675"

That's what I was thinking. I was also going to suggest checking out a
Ranger boat dealer. Ranger bass boats have a screw in bilge plug, but I
don't know what size.