Alternator belt 880566Q14 is for 135 hp through 200 hp 4-cylinder Verado outboards (serial number 1B311420 and above), 200 hp through 300 hp 6-cylinder Verado outboards (serial number 1B390143 through 2B144127, prior to Gen V), 200 hp through 300 hp 6-cylinder Verado outboards (serial number 2B144123 and above, Gen V), 350 hp through 400 hp 6-cylinder Verado outboards (serial number 2B141617 and above). It is the same belt as installed by Mercury Marine. See your owners manual or service manual for specific applications. Replace worn or damaged belts to maintain proper function of engine systems driven by the belt. Easy to install using common tools. The Quicksilver brand is the leader in delivering uncompromising engine oils, parts and accessories to the marine industry for over 65 years. Quicksilver is the premier supplier of Mercury Marine original Equipment replacement engine parts, oils, and accessories, but also works to serve all original Equipment brands in the marine and powersports industries. It has earned a loyal following by providing the highest quality products that are tested through some of the most rigorous environments and testing procedures. No aftermarket company comes close to the level of research and design as Quicksilver; buying Quicksilver is buying performance, protection and peace of mind.