91304-KK3-830 O-Ring (9.4X2.4) - Overview. The 91304-KK3-830 O-Ring (9.4X2.4) is a vital sealing component used in Honda marine engine systems. This genuine OEM rubber O-ring, sized with a 9.4mm inner diameter and 2.4mm thickness, supports the engine's sealing system to prevent leaks and maintain a watertight connection essential for reliable engine operation. Designed to perfectly fit and integrate with existing Honda marine engine components, it upholds precise factory specifications, ensuring