Mercury/Quicksilver 35-18458Q 3 Fuel Filter w/ Black Sensor Oil Filter Aquabloc® is a unique engineered

Aquabloc® is a unique engineered media that incorporates pleat-spacing corrugations and a graduated pore structure to increase dirt-holding capacity and extend filter life

Sierra Marine Fuel Filter is equivalent to parts:

The front closure has  a concealed #10 vislon zipper

which can disrupt fuel delivery they also double as a pressure release valve for the gas tank

Mercury/Quicksilver 35-18458Q 3 Fuel Filter w/ Black Sensor Oil Filter Aquabloc® is a unique engineered35 18458Q3 Water Separating Fuel Filter Kit With Black Water Warning Sensor Replacement water separating fuel filter element includes black screw in sensor 10 micron fuel filter removes harmful contaminants, particles and power robbing water from your fuel before it gets into the engine Internal epoxy coating and corrosion resistant external paint for increased weather resistance Easy to replace annually when winterizing your engine or every 100 hours