On Wed, 15 May 2013 07:01:18 -0700, DD_BobK wrote:

1) That elbow is meant to attach to your existing flex. The end with
straight thread (the bigger end) makes up the water connection to the
flex, The smaller end looks to be 1/2".... in screws into just able an
wet location box.

I guess I missed the clue stamped right on the elbow all along!
http://www1.picturepush.com/photo/a/...g/13045079.jpg

The enigma turns out to be that the elbow was 1/2 inch on both sides!

The clue I missed is that it was clearly stamped 1/2 inch, but it never
occurred to me that this meant *both sides* were half inch (yes, even the
side that measures out at 1 inch).

Note: The straight-thru connectors are stamped 1/2NPT.