Feature 1Fitment: Fuel injector leak test check kit fits for Cummins ISX Signature Engine. Please confirm whether your model is applicable. 2OE Number: Replacing manufacturer part number of this fuel injector test check kit for reference is 3164001, original factory standard. 3Function: This test kit checks whether the combustion gas leaks through the fuel rail check valve of the fuel injector, or other conditions that allow gas leakage through the injector into the fuel rail. 4Important Check Tools: Fuel injector check tool is used to test whether the fuel injector has leakage, which will cause the engine to shut down slowly or run excessively under the key off condition. 5Recommendation: It is recommended to use this tool to check the fuel injector before replacing the fuel injector or metering actuator.SpecificationItem Type:FuelInjectorLeakTestKitMaterial: MetalOE: 3164001Fitment:Fit for Cummins ISXFit for Cummins Signature .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x FuelInjectorLeakTestKit1 x HoseNote1. Please double check the part number of your item, matching information is for reference only.2. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!