【"MUST HAVE"】This Fuel Injector Block off Tool Cap Kit is used to plug fuel rail during fuel pressure diagnostics on Dodge trucks with 6.7L Cummins Turbo Diesel and 6.6L 2006-2010 Duramax LBZ & LMM diesels. A cap can be used to identify the individual cylinder that is at fault while doing a return flow volume test. Also can be used to diagnose engine knocking sounds that may be caused by diesel injector or single cylinder problems. 【Fit for Dodge Ram/Ram】This Diesel Rail Fuel Injector block-off Cap Kit is compatible with 2007 Ram 2500, 3500 Cummins ISB 6.7L Diesel & 2008-2010 Ram 2500, 3500, 4500, 5500 Cummins ISB 6.7L Diesel. Also compatible with Ram 2011-2018 Ram 2500, 3500, 4500, 5500 Cummins ISB 6.7L Diesel. 【Fit for GMC / Chevy】This Diesel Rail Fuel Injector block-off Cap Kit is compatible with 2006 GMC / Chevy 2500, 3500 Duramax 6.6L LBZ Diesel & 2007 GMC / Chevy 2500, 3500 Duramax 6.6L LBZ/LMM Diesel & 2008-2010 GMC / Chevy 2500, 3500 Duramax 6.6L LMM Diesel. 【Fit for Medium Duty GMC】This Diesel Rail Fuel Injector block-off Cap Kit is compatible with 2007 GMC Topkick C4, C5 Duramax 6.6L LBZ/LMM Diesel & 2008-2010 GMC Topkick C4, C5 Duramax 6.6L LMM Diesel. 【Durable Quality】Made of high quality and high strength STEEL & COPPER for durability and good performance. Anti-rust surface, keeping good rust, wear and corrosion resistance. 【100% Satisfaction Guarantee】The johntruck Team aims to provide you the best products and services. Support 30 days returns and 12 months warranty. Please feel free to contact us if you have any question. 🔴 Fit for Dodge Ram: Compatible with 2007 Ram 2500, 3500 Cummins ISB 6.7L Diesel. Compatible with 2008 Ram 2500, 3500, 4500, 5500 Cummins ISB 6.7L Diesel. Compatible with 2009 Ram 2500, 3500, 4500, 5500 Cummins ISB 6.7L Diesel. Compatible with 2010 Ram 2500, 3500, 4500, 5500 Cummins ISB 6.7L Diesel.