ALL Tool Depot Coalescing Filter 0.01 micron FILTER Replacement FM86 Series QTY 1 FOR the following models ATDFRLM863, ATDFRLM864, ATDFM863,ATDFM864, ATDFRM863, ATDFRM864 Replace filter to keep your Air clean system longer lasting and Keep maintain best quality at your work. When trying to figure out which type of filtration is best for your application, remember that the lower the micron rating of the filter element, the more contaminants it removes. 0.01 micron being the most efficient. Most particulate filters come standard with 5 micron elements