Valvtect Marine Motor De-Carb - 13 oz. Specially formulated to de-carbonize 2 & 4 cycle marine engines. Provides quick and complete clean-up of carbon deposits, gum and varnish that can cause pow-erhead failure. Just one treatment can clean up deposits and can significantly improve engine power, performance and fuel economy. Replaces OMC part #174996. Use one can per engine. ValvTect Marine Motor De-Carb is designed to:Remove carbon, gum and varnish. Prevent powerhead failure. Free sticky rings. Restore power and performance. Reduce fuel consumption. For 2 & 4 cycle engines.