Carburetor Replacement Diaphragm 237-550.Universal replacement diaphragm designed for most standard carburetor systems in small engines and automotive applications.Diaphragms are made to withstand ethanol blended gasoline. Comes with new mounting screws, Regulates fuel-to-air mixture by flexing with engine vacuum changes to maintain proper fuel delivery.Direct replacement part that fits standard carburetor configurations for straightforward maintenance and repair.Helps restore engine power maintain smooth idle when replacing worn diaphragms.