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
Seems to be much better vs factory. It Bottoms out before hitting the aluminum which makes it feel as it’s really seating down. The factory ones just fall in and down feel like they seat at all.
