Quicksilver thermostat 8M6010294 is for use on select 25 hp through 200 hp Yamaha 3-cylinder, V-4 and V-6 2-cycle outboards. This Quicksilver thermostat is designed to meet all OEM specifications. See your owner's or service manual for specific application and installation information. Hardware, gaskets or seals for installation sold separately. This Quicksilver thermostat replaces the following OEM part numbers: 688‐12411‐00‐00, 688‐12411‐01‐00, 688‐12411‐10‐00, 688‐12411‐11‐00, 6E5‐12411‐10‐00, 6E5‐12411‐20‐00, 6E5‐12411‐30‐00. Also can be found in the aftermarket as 18-3540. 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 Original Equipment brands in the broadening marine, powersports and power equipment 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.