Permatex Enviro-Safe . Effectively removes gum, varnish, and deposit build-up. Cleans chokes, carburetors, linkages, heat risers, and PCV valves quickly. Improves performance, and fuel burns more efficiently. Biodegradable, noncorrosive, and noncaustic. Low toxicity and no CFCs or chlorinated solvents. 12.5 oz. net weight aerosol.