Blow gun nozzle designed to dramatically boost CFM (cubic feet per minute) output. Rigid molded plastic Venturi nozzle with rubber gasket and knurled aluminum collar. Venturi effect, draws in outside air to multiply the CFM output of the compressed air. Maximum air flow or up to 40 CFM. Non-corroding, meets OSHA (Occupational Safety & Health Administration) standards. Eliminates the need to buy a larger air compressor or specific high flow blow gun. Compatible with 6 mm shaft pistol-style or 1/8 inch NPS traditional thumb switch blow guns.