Part Number :807166A1 Package Includes:2*Water Shutter Flappers 4* Rubber Grommets Enhanced Engine Protection:The water shutters are strategically positioned within the engine exhaust pipes, just before exhaust gases pass through the transom. Preventing the back flow of lake water during engine shutdown, they safeguard your engine from potential damage caused by overheating. Easy Installation:Our kit includes two exhaust pipe water shutter flappers along with four rubber grommets, ensuring a hassle-free installation process. No specialized tools are required, making it convenient for both DIY enthusiasts and professionals.