Sierra International Marine Universal Design 10 Micron Replacement Filter for Yamaha Outboard Motor is a fuel water separator that removes over 98.8 percent of emulsified water from the gasoline. It is a 10 micron filters are over 90 percent efficient at removing particles as small as 10 microns. All filters flow at 90 GPH to feed even the hungriest motor. This micron filters is recommended to prevent the damage to sensitive inboard and outboard fuel injection systems.