Quicksilver 8M0172754 Corrosion Guard Engine Protect - 12 ozGenuine OEM Mercury-Mercruiser part. Lightweight corrosion inhibitor formula designed to protect engines from rust and oxidation in freshwater and saltwater environments.Special Order ItemFeatures: Marine engine corrosion inhibitor; Lightweight formula remains clear; Engineered for saltwater and freshwater environments; 12 fl. oz. spray can; Corrosion Guard Engine Protect formula is engineered for marine engine blocks and metal components.