91302-MB6-830 O-Ring (13X3.0) - Overview. The 91302-MB6-830 O-Ring (13X3.0) is an essential sealing component used within Honda marine engine systems. This rubber O-ring has an outer diameter of 13mm and a thickness of 3mm, designed specifically to prevent fluid and gas leaks by forming a tight seal between mating parts. Suitable for oil tank and crankcase cover applications, it supports the fuel and lubrication systems in Honda engines. Crafted to OEM specifications, it ensures seamless integra