1Set Fuel Injector O-Ring Gasket Kit for Chevy Duramax LLY LBZ LMM 2004.5-2010

For GMC Yukon 6.6L 2004 2005 LLY LBZ LMM Diesel. The o-ring is made of fluororubber, which is oil resistant, high-temperature resistant; the shim is made of red copper, which is softer and it can prevent fuel injector from loosing.