what is this device?

[treeplanter]

I need help identifying this device on my 1971 GMC fishbowl, it is in between two air tanks and has pipe connections to them, cant find anything in my manual that details it.

[TomC]

Air water separator. I had the same type on my AMGeneral. I don't believe they are made anymore, so I had a new one installed. Good Luck, TomC