u/Gidgiddoni3N3

I did a bad thing and broke a pipe trying to replace a valve. You can see what's left of the cut off pipe on the right of the unit. Does that look long enough I can get a fitting on it? If not, it looks like it should unscrew but I can't get it to budge for the life of me. So I think I may need to replace this unit... Whatever it is. It's a secondary water line, so I'm less inclined to think it's a check valve as this isn't drinking water. But what do I know... So maybe pressure regulator?