Genuine OEM Kia Fuel Injector O-Ring, part number 338172F600. This vital O-ring creates a tight seal around the fuel injector, preventing fuel leaks and maintaining optimal fuel pressure within the engine's fuel system. It is positioned at the base of the fuel injector. Using a genuine OEM O-ring ensures the correct material composition and precise dimensions for a reliable, long-lasting seal, crucial for preventing fuel system issues and maintaining engine performance.