The Mastercool Vacuum Type Cooling System Filter Kit, No. 43013, is designed to shorten the time it takes to refill with new coolant by creating a vacuum into the cooling system. This kit eliminates the need to complete time-consuming air bleeding after refilling new coolant, the company says. A conical adapter offers wide application to fit different filler necks, and the kit can be hooked underneath the vehicle's hood for easy access. The kit includes a vacuum purge and refill tool, coolant hose and a universal radiator cap.