The indentions on the side are for a spanner wrench to tighten this nut onto a threaded rod. The top is a decorative cover.
this post was submitted on 09 Oct 2023
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What is this thing?
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Does the "lid" screw in or snap onto the top
Edit: the hole in the side (tiny hole) should also have something to screw into it
The lid screws in.
There are three holes equidistant around the perimeter. They do not go all the way through.
Really? Then my guess is those may be for a tool to hook into for turning. All in all it looks like something pressure line or liquid line related
i saw something like this once where it connects a tank of carbon dioxide to a sodastream type of drink bubbler.
Looks like a spanner nut and the cap appears to be a jam screw to lock it in place.
I think I found the screw plug.
https://www.phoenixcontact.com/en-us/products/plug-for-cable-screw-gland-hc-bs-pg16-1674516
A couple of more pics.
Need to see the bottoms of those pieces.
Kinda looks like something to adjust pressure but I'm not sure.