91304-ZY3-000 O-Ring (49.4X3.1) - Overview. The 91304-ZY3-000 O-Ring (49.4X3.1) is a crucial sealing component used in Honda marine engine systems. This specially designed O-ring supports the fuel and fluid sealing system by preventing leaks and ensuring the efficient operation of engine components. Manufactured to precise factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Specific O-ring sized 49.4mm outer