Oil tank reservoir cap assembly 43300A9 is for select 135-250hp Mercury and Mariner 2-cycle outboards. The 2-cycle oil reservoir tank cap assembly includes the cap, float, sender and wiring harness. Use only Mercury/Quicksilver 2-cycle oil in your Mercury or Mariner outboard. See your owner's manual or service manual for more information. 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.