Sierra parts are machined to perfectly match the OEM part they replace, which gives trained technicians and DIY mechanics the confidence they need when making necessary repairs. Parts are also designed specifically to be of marine-grade quality to resist corrosion and provide reliable operation for years. The 10-Micron filter removes 99% of emulsified water from fuel and maintains fuel flow through the entire filtering process.18-7967 Applications:• Mercury Marine: 35-18458Q3 Reliable construction will resist corrosion For Mercury Marine engines | Fuel/Water Separator w/ 10-Micron Filter For Mercury Marine, Part #18-7967