B3C Fuel Solutions 4 oz. Ethanol Shield. This synthetic fuel additive offers protection for your entire fuel system. It effectively treats the problem, not just the symptoms, by removing water, preventing ethanol phase separation, and containing rubber and plastic conditioners. It also increases octane, stabilizes fuel, lubricates the upper cylinder, reduces emissions, and is safe for 2-cycle engines. Ethanol Shield is registered with the EPA and recommended for use with nonroad gasoline engines. It keeps fuel fresh, ensures easy starting all year round, and protects above and below the fuel line.