Sierra 18-7718 Mercury Fuel FilterSierra Inline Fuel Filters are direct replacement OEM filters, making them easy to install. All Sierra Inline fuel filters are tested and approved for ethanol-based fuels and meet the demands of today's high tech-high performance engines.Features: In-line, under cowl fuel filter; Sonically sealed end caps.; OEM matched filter media.; Maximum performance with no restrictions.; Approved for use with ethanol-based fuels.; Micron Rating: 30; It is recommended that you inspect filters regularly and replace every 50 hours of operation or at a minimum of at least once per year, preferably when you winterize.Interchangeable with: Mercury Marine; 35-879885T; 35-879885Q;