Interstate Pneumatics W1260 3/8" Black Metal 3 cu-in bowl lubricator. Air lubricator provides automatic line lubrication to extend air tool life. The 3.0 Cu-in. quick-release bowl and quarter turn drain provides easier use. Lubricator injects air tool oil in line to lubricate your air tools and keep them running smooth. Adjustment knob on top regulates amount of oil distributed. Always install in a line used for air tools only as oil will contaminate paint guns. It can be freely combined with other air source treatment products.