QUICKSILVER 423511 Continuity Washer, 2 Pack Continuity washer 423511 can be used on 135-275hp Mercury and Mariner outboards; MerCruiser Alpha One and Bravo One sterndrives using Flo Torq I hubs. See your owner's manual for installation instructions and the Flo-Torq hub, thrust washers, and prop nut part numbers to best fit your engine or drive with this propeller. 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.