Coolant is easily refilled by creating a vacuum in the radiator.; Eliminate airlocks created while refilling coolant.; Checks for leaks and refills in seconds.; Provided with a universal adapter with 3 rubber rings: 35 mm ; 39.5 mm ; 44 mm; Adapter rings expand ca. 4 mm when turning the rotor on adapter.; Stock Ref. No. 9CL-71012