Genuine OEM Hyundai Cylinder Block Insert, part number 2117104002. This precision-engineered component is designed to fit within the engine cylinder block, typically at the upper section. Its function is often related to directing coolant flow, managing oil drainage, or providing structural support within the engine's critical areas. Using a genuine OEM insert ensures exact dimensions and material composition, which are crucial for maintaining proper engine cooling, lubrication, and overall structural integrity under high operating temperatures and pressures.