Refill your cooling system without airlocks. No more system purging or bleeding. Checks for system leaks under vacuum - know before you refill. Refills system with coolant in seconds.Features: Compact size - easy to use in tight areas. Push button control valve - works faster, no need to change hoses. Shop-air operation - draws fast and powerful vacuum using your shop compressed air supply. Rugged vacuum gauge protector - provides secure handling and protection. Works on all systems - Includes a built-in Fit-All cone adapter. Including fitment to light and heavy-duty trucks.