91307-PNA-003 O-Ring (9.5X1.9) - Overview. The 91307-PNA-003 O-Ring (9.5X1.9) is a vital sealing component used within Honda marine engine systems. This O-Ring provides a secure seal to prevent fluid leaks in the engine coolant temperature sensor system, ensuring reliable engine operation and protection from damage. Designed according to OEM specifications, it guarantees seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Authentic OEM Honda O