Genuine OEM Audi Cooling System O-Ring, part number 4E0121666. This essential O-ring is designed to provide a reliable seal for various cooling system components, preventing coolant leaks and maintaining optimal system pressure. It is specified for a rear position within the cooling system. Made from high-quality, heat-resistant rubber, this O-ring weighs 0.0024 kg. Using a genuine OEM O-ring ensures proper material composition and dimensional accuracy, critical for long-term sealing integrity against temperature fluctuations and coolant chemicals.

Catalogue entry: SEAL. RING 38X4 ×2.

Fitted with: 4E0121142 SPRING, 4D0133335 Cap closure.