21 Micron Fuel Water Separator Kit | Sierra 18-7848-1 Aluminum filter head with 1/4 in. NPT inlet/outlet ports & short spin-on filter removes 99.8% of emulsified water and contaminants from incoming gasoline. Sierra fuel water separating kit Kit includes 21 micron 18-7844 short fuel water filter, 18-7853-1 aluminum mounting bracket, and (2) 1/4 inch NPT pipe plugs Protects marine engines by filtering water, dust, and dirt in fuel supply Short style filter measures 3.875 inches in length 21 micron filtration Aluminum mounting bracket includes (2) 1/4 in. NPT inlet and (2) 1/4 in. NPT outlet fuel ports For use with most 2 cycle and 4 cycle marine engines Will not separate 2 cycle oil from 2 cycle fuel Approved for use with ethanol blended fuel Designed to withstand the harsh conditions of the marine environment Filter features an epoxy coated inside to resist corrosion 90 GPH flow rate Replaces Mercury 35-802893Q4, 35-807172A4, 35-807172Q4, 35-60494A4, 35-805369A4, 35-57250A1, 35-55501A1, 35-52456A1, 35-60494A1, 52444 Replaces Mallory 9-37850