This single lawn mower carburetor diaphragm is a small but vital component for your mower's carburetor, especially for two-stroke engines. The diaphragm is a flexible rubber or plastic membrane that flexes to pump fuel from the tank into the carburetor bowl, ensuring a consistent supply of fuel to the engine. Over time, these diaphragms can become brittle, crack, or tear, leading to poor engine performance, hard starting, or a failure to run. This non-OEM replacement diaphragm is a cost-effective solution for restoring your mower's fuel delivery system. Please verify compatibility with your specific carburetor and engine model before purchase.