Same great 16-PB Penetrating Catalyst formulation with the new Pro Straw Control Flow Technology. Greater flexibility to spray a conical fan spray to coat large surface areas, or transition to a stream spray for hard to reach areas. Use on automotive, industrial, marine, plumbing & other equipment. When straw is extended, the adjustment knob allows you to reduce (or increase) the flow rate. Permanently fixed clear straw, so no more losing the straw from the cap mount. Rugged and simple design allows full, reduced or no flow with valve closed. #1 selling penetrant since 1957, helps you break loose rusted nuts and bolts. Contains non-evaporating lubricant that saves time and equipment by protecting against further rust and corrosion.