23172-ZW1-013 Mount Case Gasket - Overview. The 23172-ZW1-013 Mount Case Gasket is an essential sealing component designed for Honda marine engine systems. It provides a robust, watertight seal for the engine's mount case, protecting against water ingress and ensuring the structural integrity of the mounting assembly. This gasket plays a crucial role in maintaining reliable operation by preventing leaks that could damage engine components or reduce performance. Engineered to fit Honda's BF75A1,