Sierra 18-99200 FuelWater Separator Canister Filter - 30 Micron The Sierra 18-99200 FuelWater Separator Filter is a 30 Micron filter that meets OEM specifications for removal of emulsified water. This filter features fast and simple element changing with its spin-on design. FuelWater Separator Filters prevent engine damage such as fowled injectors and increases the life of downstream filters. Sierras 18-99200 Filter canister is epoxy coated to protect against corrosion. Includes replacement gask