Look like inline oilers to me.
They will provide a steady stream of oil into an air tool. I've used them in shops with water in the lines. Not sure they really help, but made me sleep better...
Yep, in line oilers. They are nice until they start to leak and or do other wrong things. I no longer have any. I just put a few drops of air oil in the tool before use. Been doing that for years now, no problems…Dave
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