This Stens intake manifold carries clean air from the filter to the carburetor to create the optimal mixture of air and fuel. The intake manifold plays a key role in the smooth operation of lawn and garden equipment. The proper fuel/air mixture is essential to maximize operating efficiency and overall performance of the engine. Stens intake manifolds guard against vacuum leaks that can cause engine surges and rough operation. Made from durable materials, these intake manifolds resist cracking, temperature extremes and chemical exposure that can compromise performance. A properly functioning intake manifold improves operating efficiency and lowers engine temperatures.