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O-ring 👍

Tighten it good, still could hear a little hiss. The nut is top of the pressure regulator, there is the male thread coming out of the paint gun and identical one on the bottom of the regulator. I guess I need some sort of nut fitting like that to go to a connector on the air hose. Don't know...

Got a paint sprayer with regulator from harbor freight and can't figure out what kind of connection this is. This connection comes out of the gun into the regulator and then the same short Male connection comes out of the bottom. If I just thread a quick connect on this short thread it leaks...