Genuine 4K1-121-081-G Coolant Overflow Hose

The Genuine 4K1-121-081-G Overflow Hose is an OEM-quality coolant overflow hose designed to factory specifications for Audi vehicles. This hose connects the cooling system's expansion tank (overflow reservoir) to the coolant circuit, allowing coolant to flow back and forth as the engine heats and cools, maintaining proper system pressure and fluid levels.

As a Genuine OEM part, this overflow hose is manufactured to the same standards as the original component installed at the factory, ensuring a precise fit and reliable long-term performance. Replacing a cracked, brittle, or leaking overflow hose is critical to preventing coolant loss, overheating, and potential engine damage.

Key Features:

• OEM Genuine part — direct factory replacement, no modifications required
• Manufactured to original equipment specifications for precise fitment
• Constructed from high-quality, heat- and pressure-resistant rubber/silicone compound
• Maintains proper coolant flow between the expansion tank and cooling circuit
• Helps prevent coolant loss, pressure drop, and engine overheating
• OEM Part Number: 4K1-121-081-G

For best results, inspect all surrounding coolant hoses and clamps during installation and replace any worn components at the same time. Always use the manufacturer-recommended coolant type when topping off or refilling the system.