refrigerated air dryers

[zipthetrip]

I am looking to replace a refrigerated air dryer and have come up with three manufacturers. Kaeser, Pnumatech, and Donaldson. Any idea who makes the more reliable unit? Also, cycling or non - cycling? Any help would go a long way. Thanks!

 

[adrianviorel]

Just send them inquiries and ask to specify guarantee period