(12) 16 oz. Cans. Cleans and frees moving parts on carburetor, PCV valves. OFF is the modern quick way to clean and lubricate automatic chokes, PCV Valves and systems, heat risers and carburetors. It rapidly cleans carburetors without removing them. Frees frozen or inoperative choke and carburetor linkages caused by dirty parts. Cleans out PCV valves and hoses to insure proper operation of the PCV system. This product has been thoroughly tested to insure no adverse effects to oxygen sensors.