40113-ZW4-H11 Grommet Case (Lower) - Overview. The 40113-ZW4-H11 Grommet Case (Lower) is an essential component in Honda marine engine systems. This part functions as a rubber seal located on the lower crankcase, designed to prevent water intrusion, air leaks, and reduce vibrations between the lower unit and the engine block. By maintaining a reliable seal and minimizing mechanical disturbances, this grommet helps keep the engine operating smoothly and efficiently. Designed for durability and pr