91308-PK1-003 O-Ring (26.2X2.4) - Overview. The 91308-PK1-003 O-Ring (26.2X2.4) is a precision-engineered sealing component essential to Honda marine engine systems. Specifically designed for use in oil pump assemblies and related components, this O-ring ensures a tight, leak-proof seal to maintain optimal engine performance and reliability. Crafted to match exact factory specifications for dimension and material, it seamlessly integrates with existing hardware and seals within the marine engine