In addition to maintaining the air dryers, the best alternative to reduce the impact of water in the air tanks is to put the lanyard pull type drain valves on the two brake tanks and the auxiliary (wet) tank making it easy to drain them every day you drive the coach and every week when you are using the coach but not driving it. Next time I have my coach on a lift, that is on my to do list. Having to crib up the coach and crawl under it is a pain and I suspect that there are coaches out there that haven't had the air tanks drained in years. As Wally pointed out, that is a prescription for rusting out the check valves. The attachment shows one of the old corroded check valves (center) Newell removed from my front tank and the two replacement valves.
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