17105-Pwa-007 Inner Manifold Gasket - Overview. The 17105-PWA-007 Inner Manifold Gasket is a critical sealing component designed specifically for Honda marine engine systems. Its primary role is to create a precise seal between the inner manifold and the engine block, preventing air and coolant leaks that could compromise engine efficiency and performance. By ensuring this tight seal, it aids in maintaining optimal combustion and overall reliable engine operation. Manufactured to match factory s