The product is a NOS (new old stock) AC CV768C PCV valve specifically designed for GM vehicles. The manufacturer part numbers associated with this product are 6487503 and CV768C. This PCV valve is a crucial component in the valvetrain system of an engine, helping to prevent harmful contaminants from entering the combustion chamber. As an OEM part made by GM, it is designed to meet the specific requirements and specifications for GM vehicles, ensuring high quality and performance.