Sierra is the industry leader in 10-micron technology. Sierra filters not only protect your engine, they are over 90% efficient at removing engine damaging 10-micron and larger particles without starving the engine for fuel. Don't be fooled by other 10-micron imitators that don't list their efficiency. Sierra filters are independently lab tested and approved. Sierra offers the widest selection of OEM direct replacement fuel filters on the market. Sierra supplies OEM manufacturers with patented fuel filter technology. Sierra offers a full line of cartridge, canister and inline filters to fit just about every engine in the marine market.