6158120490 Chicago Pneumatic Oiler 1/2". Install one of these lubricators at the point of use to lubricate your air-powered hand tools. Lubricators mount directly to the air inlet of your tool or inline about six feet before your tool. Less maintenance of the tool. Guarantee the lubrication even on applications far from FRL. Steel housing for high durability. Thread size 1/4" NPT.