Sierra fuel water separators remove over 98.8% of emulsified water from your gasoline. Sierra's 10 micron filters are over 90% efficient at removing particles as small as 10 micron. All filters flow @ 90 GPH to feed even the hungriest motor. Recommended to prevent damage to sensitive inboard and outboard fuel injection systems. Type-1/4" Aluminum, Filter-High Capacity, Contains-(1) 7866 & (1) 7853-1, Replaces-Yamaha - MAR-SEPAR-AT-OR -Sierra