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When the air governor reaches full set pressure it sends an air signal to the compressor unloader to stop making pressure and it also sends the air signal to the air dryer to purge. I think its positive air but I am not 100 percent sure about it. Blow some air into the small line on your dryer...

I find them online in the 50 dollars range usually. If you have to order one from the manufacturer they are around 100. I have never tried servicing a tube with fins one. I had one of the service kits a while back. Big bag of beads, small filter and a bunch of gaskets and o rings if I remember...

Front what I have seen. The tube with fins is a first gen dryer. The pure air plus on the m939 trucks is second gen and the purest type is the 3rd gen. The purest dryer definitely does a better job drying the air than the tube with fins and its alot easier to service. You still want to replace...