This cooling system vacuum purge and refill kit from draper is expert quality it is designed to dramatically reduce cooling system refill times by stopping air locks from developing meaning you can avoid time consuming cooling system bleeds the unit plugs easily into an air line and then attached to the cooling system to create a vacuum the filler hose is connected which allows pre mixed coolant to flow easily into the system the set comes supplied with a gauge 13m of clear hose four adap