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Engineered from high-quality rubber for superior resistance to fuel, oil, and heat, the Dorman Fuel Injector O-ring is designed to provide a secure air-tight seal. This complete kit, containing multiple rings in various sizes, makes installation fast and convenient. O-rings are recommended for replacement anytime you service the fuel injectors. Vehicle model years this part fits: Ford F-250 Super Duty: 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ford F-350 Super Duty: 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ford F-450 Super Duty: 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ford F-550 Super Duty: 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019