The Mercury Mariner Outboard 1990-1997 40-60 HP Oil Pump 812960A1 is a freshwater specific part designed for outboard engines. It is manufactured by Mercury and is part of the oil systems category for boat parts and accessories. This oil pump is essential for maintaining the proper functioning of the engine, ensuring optimal performance and durability. With its specific fit and quality construction, this product is a reliable option for boat owners looking to replace or upgrade their outboard engine's oil pump system.