Genuine high quality Sierra Oil Filter Model No 18-7811-1 to suit modern 4 stroke outboard engines -These fuel filters are designed to be a an equal or higher specification replacement to any manufacturer&';s OEM product. Recommended use period 50 hours of operation or minimum annually which ever period comes first. This Sierra 18-7811-1 Filter will suit a wide range of marine engines and we have attempted to list some replacements below - The list is not exhaustive and the cartridge may suit many other engines - We recommend matching by the dimensions listed below. Features Suits 4 Stroke Marine Engines Specifically designed to match the OEM filter. Anti-drain back valves help prevent dry-starts. Epoxy coated steel canister prevents corrosion and allows for easy installation and removal. Designed for the marine environment. Meets or exceeds OEM filtration requirements. Wide selection of filters for inboards, diesel and outboard engines. Dimensions Thread: 20mm x 1.5 Length: 3 inches Diameter: 3 inches