Genuine OEM Hyundai Fuel Filter Element O-Ring, part number 31319N9850. This vital sealing component is designed to create a leak-proof seal for the fuel filter element, preventing fuel bypass and ensuring that all fuel passes through the filter for proper purification. A correctly sealed fuel filter is essential for protecting the fuel system from contaminants. Using a genuine OEM O-ring ensures the correct material composition, dimensions, and resilience for a reliable, long-lasting seal against fuel and temperature variations.