Genuine OEM Hyundai Cylinder Block O-Ring, part number 2114303000. This O-ring provides a critical seal for the cylinder block, preventing fluid leaks and maintaining proper pressure within the engine. It is specifically designed for sealing components within the cylinder block assembly. Made from durable rubber, it measures approximately 30mm in diameter. Choosing a genuine OEM O-ring ensures the correct material composition, elasticity, and dimensional accuracy for a leak-free and long-lasting seal.