40-micron and 5-micron filter elements for NITRA® AF-series Filters and AFR-series Filter Regulators are available with new HDPE (high density polyethylene) filter material for all sizes. The 40-micron replaceable filter element is standard; for stricter filtration, the optional 5-micron filter element is available and is easily installable. NITRA AF-series pneumatic air filters clean incoming compressed air for shop/plant air supply or air sources for individual machines. NITRA particulate and moisture separation air filters are available in a wide variety of port sizes to meet a broad range of pneumatic air supply filtration applications. AFR-series combination air filter/regulators combine a pneumatic particulate / moisture separation line filter and adjustable pressure regulator for pneumatic line filtering and regulation in a single unit. NITRA HDPE filter elements start at $1.25 and have a 2-year warranty.