2008-2010 FORD 6.4L POWER STROKE INJECTOR O-RING KIT (SINGLE INJECTOR)Engineered from rubber for superior resistance to fuel, oil, and heat. A 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.OE Cross-Reference:8C3Z-9229-A (FORD)1855644C3 (NAVISTAR)1873425C92 (NAVISTAR)**California Proposition 65 Warning:Diesel engine exhaust and some of its constituents are known to the State of California to cause cancer, birth defects, and other reproductive harm.Visit:www.p65warnings.ca.gov