Genuine 03H 121 041 Coolant System O-Ring Seal

The Genuine 03H 121 041 is an OEM-quality O-ring seal designed for the cooling system on select Volkswagen and Audi vehicles. This small but critical sealing component prevents coolant leaks at pipe and housing connections, helping maintain proper system pressure and engine temperature regulation.

Key Features:

• Genuine OEM part manufactured to original factory specifications
• Provides a precise, leak-free seal at coolant pipe or housing interfaces
• Made from heat- and coolant-resistant rubber compound for long-term durability
• Direct OEM replacement — no modifications required for installation
• Helps maintain cooling system integrity and prevent overheating

When replacing coolant pipes, water pump components, or related hardware, always replace the O-ring seal to ensure a proper, lasting repair. Using a Genuine OEM O-ring guarantees compatibility and performance that aftermarket alternatives may not match.