This replacement fuel tank check valve is designed for use on select Polaris Sportsman ATV models equipped with carbureted or EFI fuel systems. On carbureted models, the valve installs at the bottom of the carburetor, while on EFI models it functions as part of the fuel tank venting system. Manufactured to match original fit and function, this check valve installs directly in place of the factory unit. Many EFI machines use two check valves, so quantity should be verified before ordering. Replaces Polaris part number 7051011. Fitment List 2008–2010 Sportsman 300 2002–2013 Sportsman 400 2006–2007 Sportsman 450 2002–2013 Sportsman 500 2003–2005 Sportsman 600 2002–2007 Sportsman 700 2007–2014 Sportsman 800