It's the part that attaches the base to the pole. It's a brass cylinder with a small threaded hole on the bottom and threading on the outside of the top. The base has a threaded pipe that goes into the small hole, and the top screws into the pole of the lamp. Quickly looking at Grainger's site, I don't see anythign that looks like what I need, but I'll keep checking. Thanks for the info.
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