High-performance fuel injected engines require ultimate fuel filtration, separation of water from the fuel supply, and maximum fuel flow. Sierra's new filter elements deliver all three of these critical performance factors. 7900-Series 10 micron filters eliminate harmful contaminants at over 90% efficiency, while removing over 99% of emulsified water. They're engineered for today's sterndrives and inboards, along with 2-cycle and 4-cycle outboards. Sierra 10 micron filters were independently tested to JIS, SAE J1839/J905 and ISO 4548-12 standards. Sierra Part #18-7943. For OMC engine | Fuel/Water Separator Assembly For OMC Engine, Part #18-7943