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This is a very inexpensive tool that allows you to get all the air out of cooling systems when changing the coolant or doing any repairs that requires the cooling system to be opened . It comes with the most common radiator attachments . The funnel holds about a 1/2 gallon of liquid . Once the thermosat opens air will be expelled thru the funnel . The great part about this is that it requires very little work , you add coolant as the air is expelled . Once the system is free of air & any coolant remains in the funnel , you seal the funnel with the plunger & remove the funnel . Ive used it several times & it works very well .