Quote Originally Posted by mark beiser View Post
I have a couple like that mounted on thumbscrew type core depressors.

I mostly use them for getting oil pressure readings on simi-hermetic compressors.
The depressor lets me open the valve after connecting the gauge, and close it before removing it, so there is almost no mess made.
I did not know these thumb screw depressors existed. I think I may have to get a few. Any common suppliers carrying them or are they only online?