The Lisle turbo air system test kit with smoke adapter, No. 69910, plugs the output side of the turbo and the intake inlet. Air and smoke are applied through one adapter to show the presence of leaks within the system. The kit features a pressure gauge, shut off valve, pressure regulator, and includes six pairs of stepped adapters to fit most turbo systems on cars and light trucks. Can also be used on some cooling system hoses.