21-42990A10 Mercury-Mercruiser DIAPHRAGM

Genuine OEM Mercury-Mercruiser diaphragm (part number 21-42990A10) designed for fuel system and carburetor applications. Essential replacement component for maintaining proper engine operation and fuel delivery. This diaphragm regulates fuel pressure and flow in carburetor-equipped Mercury-Mercruiser outboards and marine engines, ensuring reliable cold starts and consistent performance across all operating conditions.