Genuine OEM Volkswagen Tappet, part number 0XW109309A. This component transmits motion from the camshaft to the valves, opening and closing them at the correct time. It is located within the cylinder head assembly, interacting with the camshaft and valve stem. Genuine OEM tappets are manufactured with precise dimensions and hardness to ensure smooth operation, minimal wear, and accurate valve timing, contributing to optimal engine performance and longevity.