This part was in a catalog of rigid conduit fittings. It is just like
a reducing bushing, threaded inside and out, but it
also has a "hex nut" flange one one end so it can be turned with a
wrench. What are these normally used for?
Another clue-- the part is a Thomas & Betts 1250. Could this be
used to enter a box that has a knockout that's
a size too big?
If this is what you're talking about,
You would use it to attach 1/2" conduit or a fitting
to a cast "Malleable Iron" box or condulet that has
3/4" threaded hole. You would screw the 3/4" part
into the box or condulet using the hex flange to
tighten it with a wrench. You would then screw your
1/2" conduit or fitting into internal part of the
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