Pls identify the part

Hard to tell what I'm looking at. Is that just a compuchek fitting off the governor bolted to the dryer?

 

It looks like the governor.

 

Maybe a high pressure safety switch? Never saw one on a governor. Exhaust port already acts as high pressure switch.

 

Almost looks like the safety pressure relief valve but hard to tell from the angle of the picture.

 

Can u take another picture with out the soap?

 

Compucheck fitting for manual inflation.

 

It's a Parker 60 series nipple https://ph.parker.com/us/en/quick-c...i-iso-7241-series-b-60-series-nipples/bh1-61w used to air the truck up with shop air. Pretty handy. Could just plug it, more of a luxury.

 

I would unscrew it and replace it with a regular Schrader type air valve.
That way you can air it up anywhere if needed.