Tuga,
Thanks for getting the answer to my question. I was wondering whether the check valve within the air dryer was replaceable. Apparently it is not. I have been changing my own air dryer filters too. I change mine every year. Unless I was finding water within my air tanks you might be able to save a few bucks as Newell advises changing annually. In thinking about what could have gone wrong in Matt's case the only thing I can figure is some debris fell into the air dryer body, the filter was replaced and the debris clogged the check valve open. Only other explanation is a very curious coincident. I will be very careful that no outside debris falls into the air dryer when I change the filter.
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Steve
Newell
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