High-Quality canister fuel filter by Sierra. These fuel filters are designed to be an exact fit and performance replacement to your current OEM canister filter. Sierra recommends changing your fuel filter every 50 hours of operation or at a minimum of once per year, preferably at winterization. Anti-Drain-Back Valve Engineered with premium grade materials that will excel in the extreme marine environment Epoxy coated for corrosion resistance Heavy-wall steel canister for further corrosion protection High-efficiency filter media that meets or exceeds the OE&';s filtration Backed by Sierra&';s industry leading warranty Manufactured to meet or exceed OEM specifications Field-tested and approved Thread Spec: 3/4"