Genuine OEM Jaguar Step Tappet, part number C2C40078. This essential engine component is responsible for transferring the precise motion from the camshaft to the valve train, facilitating the opening and closing of engine valves. It sits at the top of the valve assembly, above the valve spring. Weighing 0.037 kg, choosing a genuine OEM tappet ensures factory tolerances and material quality, which are crucial for smooth engine operation and long-term durability.