Interstate Pneumatics, W1240AP 1/4 “ Standard Metal 5 oz Bowl Lubricator, W1240AP. Air lubricator provides automatic line lubrication to extend air tool life. Its oil-fog design allows bowl to be filled without depressurizing system for easier convenience. 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.