I'm re-working my vacuum plumping setup. I have a JT Turning Precision Vacuum Adapter for my PM3520 Lathe. I've measured the old fitting and the size appears to be 1/2". What I'm unsure of is if it's an NPT thread or something else. Any easy way to tell, or anyone know offhand? I'm replacing the old plastic elbow fitting I had with a brass one and don't want to force the wrong thread in there.
Paul