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?

--

Roger Long