Replacement O-Ring for Duramax VGT Turbo inlet.Used on the following WCFab Kits: Legacy S400/Stock twin kits 2004.5-2016 models, Stage 2 intake kits for 2004.5-2016 models, VGT Turbo Inlet Horns for 2004.5-2016 models, Stage 2 & 3 High Flow Bundle Kits...