The Arrow 1/4 in. Compressed Air Tool and Equipment Lubricator injects a fine stream of oil into the air stream to automatically lubricate air operated tools, equipment and other devices. This lubricator extends the life of downstream components. The equipment lubricator allows for precise control of the oil feed with its needle valve adjustment knob. Featuring a six ounce metal bowl with a sight tube, this air tool lubricator can withstand heavy use.