Gumout jet spray. Cleans the inside and outside of carburetors as well as PCV valves and the fuel-injection throttle body plate. It also removes gum, varnish, and dirt buildup. Cleans off the grease and oil from spark plug wires and manifold heat controls. Helps keep your engine easy to start, running smoothly, and trouble-free. Even fixes sticking automatic chokes. Safe for oxygen sensors and catalytic convertors. Aerosol.