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of course the manufacturer wants you to replace it! but the question is how often is really required? the unit on my truck was 20 years old when i git it and is not meant to be serviced. it was clean inside and i have not drained either of my tanks in 4 years. there is just nothing in them. now...

where does this info come from? if we are talking about a pressure-swing drier, and i think we are, it cycles once each time the compressor shuts off. if it cycles more than usual that would indicate a leak in the system. tom

many of these pressure-swing type driers will go for years without service. the one on my truck is over 10 years old and i have NEVER drained any water from the air tanks since there is none there. they do a great job. don't waste your money until you start to find water in the tanks or until it...