The OEMTOOLS 24444 Coolant System Refiller Kit purges trapped air, checks for vacuum leaks, and allows the user to refill the coolant system quickly and easily. Every coolant flush kit should be equipped with a reliable cooling system pressure tester kit and pneumatic filler. 70-110 psi Recommended Working Pressure. This all-in-one coolant filling kit drastically simplifies the cooling system service process. Using a vacuum to remove air from the system, the radiator pressure kit then uses the cooling system airlock to draw coolant into the system, filling the engine block and radiator. This eliminates the time-consuming job of having to refill fluids slowly to avoid air pockets, for a much quicker and more efficient process. Please note if your cooling system is vented, you will have to plug or seal the opening to establish a vacuum. The included cooling system adapter set consists of 5 bushings and a tapered cone adapter to fit a broad range of makes and models and comes with a convenient carrying case. Every professional and DIY mechanic knows they need an engine coolant pressure tester and coolant filler tool that they can rely on. When you use the 24444 Coolant System Vacuum and Refill Kit, you'll understand why the OEMTOOLS name is trusted by mechanics everywhere.