Stop moisture from reaching tools and equipment. These dryers have a polypropylene filter element that expands when wet, shutting off airflow until the element is replaced. They remove any remaining moisture in your air line that aftercoolers and separators don’t catch. Install them as close as possible to sensitive devices such as plasma cutters and paint guns. Because airflow will stop without warning, you should only use these dryers in systems where a sudden shutoff won’t damage tools and equipment. To prevent debris from clogging the filter element, install them after an oil filter.