Groz 60151 Air Filter Miniature - 1/4" NPT - 28 CFM (F13913-S). Groz Miniature air filters have å_" NPT inlet and outlet port sizes. Air filters are used to separate dust, dirt, moisture and other contaminants from compressed air. These filters have a die cast aluminum filter head, polycarbonate bowl with a steel bowl guard and high performance sintered bronze 40-micron filter element. Designed with a separator and shield for efficient moisture separation. This air filter bowl is equipped with a manual drain at the bottom of the bowl. Conforms to ISO 5782-1 Max flow rate: 28 CFM (800 LPM) Bowl size 0.3 oz. (9 ml) Height 4.45" (113 mm) Width 1.57" (40 mm) Max PSI 145. Dimensions: 6 x 4 x 4".