Function Overview Coolant vacuum refill kit is mainly applied to cooling system maintenance. This tool improves engine performance and longevity, it does so by eliminating trapped air from the cooling system, which in turn ensures more efficient coolant circulation Removing Residual Air Coolant vacuum refill tools are used for getting rid of the residual air within the cooling system. Through vacuum replenishment technology, air can be thoroughly removed, enabling the coolant to fill the whole system more comprehensively Leak Detection Coolant pressure tester kits gauge spots radiator and heater core leaks. Pressurize the cooling system, observe the gauge, quick changes pinpoint leaks, enabling fast repair Refilling Coolant After air removal and leak detection, coolant vacuum refill kit also serves to replenish coolant with specialized tools and adapters, coolant can be accurately added to the system, avoiding waste and contamination Multiple Adapters Coolant system refiller kit comes with rubber sleeves in five sizes, namely 31, 35, 40, 42 and 45 mm, along with a universal adapter tapered plug, meeting the requirements of different car makes and models