91301-ZW9-000 Oil Pump O-Ring - Overview. The 91301-ZW9-000 Oil Pump O-Ring is a critical sealing component within the Honda marine engine systems specifically designed for the oil pump assembly. This essential rubber O-ring prevents oil leaks, ensuring your engine operates smoothly and reliably. As a genuine Honda OEM part, it maintains seamless integration with existing components, fulfilling factory-specified dimensions and tolerances to uphold optimal performance and durability.. Key Feature