CARB FREE cleans, penetrates and dissolves gum, varnish and carbon from carburetor, linkage, butterfly valve, automatic choke, and PCV system. THREE WAY NOZZLE - Economy and flexibility. HIGH SOLVENCY - Cleans gum, resin and varnish from critical areas. EE cleans, penetrates and dissolves gum, varnish and carbon from carburetor, linkage, butterfly valve, automatic choke, and PCV system. THREE WAY NOZZLE - Economy and flexibility. HIGH SOLVENCY - Cleans gum, resin and varnish from critical areas.