The Nano D2 Series Pre Filter is an in-line pre-filter for the Nano D2 Series Desiccant Air Dryers. This pre-filter ensures that most of the moisture in the air is evacuated before it reaches the desiccant air dryer. The desiccant air dryer is very good at getting moisture out of the air, but in order for it to be most effective, it needs the bulk of the moisture to be gone. It is not good to over-saturate the dryer with really moist air, and this prefilter helps with that.
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