This product has been superseded by: MAR-10MAS-00-00. Yamaha 10 Micron Fuel Filter Assembly Aluminum Head 1/4 Inch MAR-SEPAR-AT-OR. Overview. The Yamaha 10 Micron Fuel Filter Assembly Aluminum Head 1/4 Inch MAR-SEPAR-AT-OR is a genuine Yamaha fuel filtration system designed to protect your outboard engine from water, debris, and contaminants commonly found in marine fuel systems. By filtering fuel down to 10 microns, this assembly helps prevent harmful particles from reaching sensitive engine co