Dan, the poster said those figures were written on the side of the tubing. I looked at the PEX in my mechanical room and it says 180PSI @ 73.4 deg and 130PSI @ 120 deg.
The drift I got was his numbers were (maybe ??) not directly off the tubing.
Yours ARE -
so it just might work OK with those ratings especially after the air is cooled some. Think I would take it out of the receiver to let as much water drop out and cool the air before running thru underground PEX
Dan Bentler