The Coolant Dam Pressure Tester and ISX Kit from Arctic Fox can be used to service Cummins ISX After-Treatment Injector (ATI) units. This kit works with the time saving Coolant Dam to hold engine coolant inside the engine, with little or no coolant loss, even when pipe plugs, sensors, valves and other components are removed for replacement or repair. The attached Coolant Dam quickly converts from vacuum to a pressure tester so repairs can be tested without tedious hand pumping or running the engine.