This Clean-R-Carb(R) carburetor cleaner is for use on automatic chokes, carburetor components, crankcase breather elements, and exhaust gas recycling valves. It maximizes carburetor performance and quickly dissolves deposits on chokes, carb linkage, heat risers, and PCV systems. This clear liquid cleaner is harmless to catalytic converters and oxygen sensors. It has a flash point of 0 Degrees F, a boiling point of 56 Degrees F, and a specific gravity of 0.82. It comes in a 454-gram aerosol can.