Genuine OEM Volkswagen Tappet, part number 0XW109309S. A tappet, also known as a valve lifter, is a component in an internal combustion engine that transfers motion from the camshaft to the valve train. This part is located at position 8 in the cylinder head assembly. It has a weight of 0.036 kg. Genuine OEM tappets ensure precise valve timing and engine performance due to their exact tolerances.