The CTA Turbo System Tester HD, No. 7397, is designed to locate leaks in turbo, intake, and cooling systems by plugging the output side of the turbo and intake side. The tool services heavy duty Class 6, 7, and 8 vehicles. Air is pressurized through one end of the adapter to show the presence of leaks within the system. The kit includes a pressure gauge, shut off valve, pressure regulator, and three pairs of stepped adapters. Adapters sizes include: 105mm/110mm, 115mm/120mm, and 125mm/130mm.