atlas tire machine fittings

[junkyardwarrior]

Trying to assemble and install our new tire machine (atlas PTC500). The supply line has this 1/4" barb fitting on the back. I do not recognize it. Our supply HOSE is 1/2" so I need to connect the two somehow. I removed the rest of this fitting from the regulator, and it's also an oddball fitting that I do not recognize. It's a straight fitting, no o-ring, not NPST that I can tell, too fine of a thread. So far I'm not very happy with this machine....anyway, anyone have a clue what kind of fitting this is?

 

[IndyGarage]

Are you sure that's not the fitting for the tire chuck hose? That's on the back of my atlas. I've never looked at the fitting, but that looks like a setup for one of those cheap plastic coiled hoses that has a chuck on the end of it.

The supply hose is on the side behind the breaker arm and has an oiler on it.

I just looked at that model and it's way more sophisticated than my Atlas cheapie. I watched the video, I didn't see any air lines