What is it?

Thanks for that memory jog. I knew I had something like that, and that reminded me that it was the tap on my N̈ova print processor. Unfortunately at 90 degrees to the object shown.
 
Or do you just stick it in and take it out? Oh, could it be a barrel of something, wine?, whiskey?, and you can pull that thingy out and take a sample?
No, it doesn't pull in or out; it just turns.

Thanks for that memory jog. I knew I had something like that, and that reminded me that it was the tap on my N̈ova print processor. Unfortunately at 90 degrees to the object shown.
It's not any sort of tap and nothing to do with photography.
 
Giving it away now.
3.webp
 
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