Audi B8 Lower Radiator Hose Plug - Aluminum Drain Plug Upgrade

Aluminum Lower Radiator Hose Drain Plug for Audi B8 Platform - Replaces OEM 8K0121055B

Upgrade your Audi B8 cooling system with our premium CNC-machined aluminum lower radiator hose drain plug. This precision-engineered component replaces the failure-prone factory plastic plug (OEM 8K0121055B) that commonly cracks, leaks, or breaks under heat and pressure. Compatible with B8 S4, A4, S5, A5, and Q5 models with 3.0T supercharged and 3.2 V6 engines.

Why Upgrade from Factory Plastic?

The factory plastic drain plug in the lower radiator hose is a known weak point in the B8 cooling system. Over time, heat cycles and coolant pressure cause the plastic to become brittle, leading to cracks, coolant leaks, and potential overheating. Our Type II anodized 6061 aluminum plug eliminates this failure point with superior strength, heat tolerance, and corrosion resistance.

Common symptoms of failing factory plug:

• Coolant leaks from lower radiator hose
• Cracked or brittle plastic plug
• Low coolant level warnings
• Coolant dripping under vehicle
• Visible damage to hose plug area

Features:

• Precision CNC-machined from Type II anodized 6061 aluminum
• Superior strength and heat tolerance vs. plastic
• Corrosion-resistant anodized finish
• Direct fit for lower radiator hose part # 8K0121055B
• Simple installation - no modifications required
• Prevents leaks and failures common with plastic plugs
• Lifetime durability

Installation Note: Direct replacement for plug in lower radiator hose. Drain coolant before installation. Simple swap - no special tools required.

Replaces OEM Part: 8K0121055B (plug in lower radiator hose)

Compatibility

Audi B8 Platform - 3.0T Supercharged and 3.2 V6 Engines