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Its positive air

I have acquired a few AD2 style dryers that go on the 915 trucks. Old but simple. Parts easily available. New filter kit is $55 at oreillys and 65 at napa. New lower purge assembly is $150 from Oreillys. Part number 286936X for the complete reman dryer for $275. These are large so...

As a reminder if anyone attemps to purchase an SKF air dryer make sure it had the yellow tag in it that says Holset compatible. If it has a red label on it then it will not simply install so easy.

There are still a few on ebay. Just not as cheap as they were. They can be bought thru truckpro as well https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F223483179830

I have ran two for nearly a year now. They were made for military application as they have Packard connections for the heating element. They do have a really loud purge valve compared to other dryers...

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