Genuine OEM Audi Engine Vacuum Container Retainer, part number 4M0809163B. This component is designed to securely hold the engine vacuum container within the engine bay, preventing movement and ensuring the integrity of the vacuum system. It is a robust metal bracket, measuring approximately 19.5 cm long. Using a genuine OEM retainer guarantees a precise fit and the necessary structural support, which is vital for the reliable operation of engine vacuum-dependent systems.