Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:6000725.

This is a clamp for holding a beer/wine thief siphon pump. It has a little arm to kind of hook onto the bung of a carboy or the side of a bucket and hold the siphon at a level. I printed mine out of PLA, but the durability of the arm could be improved by printing it out of something stronger.

You can find the Onshape project for this part here.