A-B1843379-AI TAPPET-VALVEOne New Aftermarket Replacement Valve Tappet Fits Briggs & Fits Stratton Vanguard Engines This valve tappet (also called a valve lifter) is a key component of the valvetrain in Fits Briggs & Fits Stratton Vanguard engines. It rides against the camshaft lobe and transfers motion through the pushrod to open and close the intake and exhaust valves, ensuring proper valve timing and engine efficiency. Replace worn or noisy tappets to eliminate valve train