The Mercury Drive Shaft Housing Plate Gasket 27-661021 (SIE 18-0912) is a high-quality gasket designed by Sierra for outboard engines. This gasket ensures a secure and waterproof seal between the drive shaft housing plate and the engine, preventing leaks and maintaining optimal performance. Made specifically for Mercury engines, this gasket is a reliable and durable component that helps to extend the lifespan of the boat's propulsion system. Color may vary from picture (green, blue, or