GROCO 2-1/2" Engine Flush Kit Adaptor [SSC-2500]2 1 2" Engine Flush Kit & Adaptor The Concept A simple quarter turn quick release plug can add safety and flexibility to any water system. Add SSC to the top of any seacock to allow instant emergency bilge pumping, or to simplify winterization and cooling system flushing. In an Emergency While the connected engine is running, close the seacock and remove the quick release plug. Excess bilge water will be pumped overboard by the engine's raw water