On Mon, 03 Jan 2005 11:53:24 GMT, "Roger Long" wrote:

Old thru-hulls are not made any more, so get the
West System brochure...you'll need it to learn how to plug old
thru-hull holes and drill new ones.


Yikes! Please tell us more about this. These things are supposed to
be NPT and NPS standard. I see fittings in the store that look just
like I've been seeing for 40 years.

What changed and when?

How could they have changed so much that you can't put a new one back
in the same hole, even if the size is slightly different?

Good question(s). I should have been more specific. All the thru-hulls on
my boat were flush fiting. A few had a non-standard flange or bevel. They
are 45 degrees, but the depth and diameter are non-standard. Believe me,
I looked at every nautical web site and boat store catalog I could find to no
avail. The mushroom style would be no problem of course.

One more point....a 1 1/2 inch "pipe" on a thru-hull is indeed 1 1/2 inches, but that's the ID.
The wall thickness is the "schedule", and I noticed that the old thru-hulls have
a greater wall thickness, but not so much as the proclude screwing on a modern
seacock.

Regards, Norm B