Specification: Item Type: Coolant Refill Kit Material: Stainless Steel + Rubber Application: Coolant replacement Features: Principle of Use: The cooling liquid is sucked into the water tank by vacuuming the inside of the water tank to generate negative pressure. In order to prevent the internal temperature of the engine from being too high due to air resistance in the cooling system pipeline when filling and replacing the coolant, vacuum filling must be used, and at the same time, it can reduce the maintenance time and is convenient and quick. How to Use: 1. Clear the water in the water tank 2. Open the car hood and hang the hook in the appropriate position 3. Connect the universal rubber joint to the water tank 4. Make sure all switches are turned off, and connect the thin tube to the tail of the mouse 5. Connect the intake pipe and press the yellow switch button to turn on the intake switch for vacuum treatment. When the pressure reaches -20--25Inhg (-50--60cmhg), turn off the NO.3 switch 6. Connect the antifreeze hose to the car body, and put the other end into the antifreeze container. The interface must be completely immersed below the water level. Turn on the water level switch to automatically add the antifreeze to the water tank. Package List: 1 Set of Coolant Refill Kit (7pcs) 1 x Tool Box