This kit has been designed to charge the turbo system with allow pressure of regulated workshop air to show the presence of leaks within the system. Professional and economic trouble shooting. Safety valve prevents applying to much pressure preventing damage. Features a pressure gauge, shut off valve and pressure release valve. This kit can also be used on cooling system hoses, turbochargers, G-Chargers. Art.1237 is an updated kit for use on modern vehicles with smaller style hoses. Universal use to fit most charging systems.