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Well this is concerning! I pull that brass valve, and indeed its a pressure relief valve. The only problem it opens at 235 psi! On top of that, the normal pressure relief valve show signs of opening. (150 psi) ((grease had sprayed out on the case)) The only thing is the gauges show normal 120...

I have few extra air dryers. I'm going to take one apart as well. Maybe take some pics. A lot of use have these on our trucks now.

No. It's some kind of valve. The inlet and outlet ports are defined, and the overpressure valve is on the side. So I'm not sure what the part does. It started chuffing air this week. I though the purge valve was sticking, but it was working correct. The secondary purge is coming from this valve...

Yeah I went through their whole website earlier. Not one spec on that part.

I have this one on my truck. I'm trying to figure out what the brass valve does. It's not the relief valve or the purge valve. haha sorry I just realized I did not load the pic!

Do you guys know what this part is on the MRAP style air dryer. (Air dryer PART # N50011K) No luck with haldex. Oh and your link worked good for me.