I do a lot of engine work (change manifolds, water pumps, timing belts, etc.) and it saves a lot of time! It also has the added benefit of being able to see if you have any leaks before refilling it with coolant (as long as it holds a vacuum you're fine!). No more adding, burping and spilling. A hose uses a venturi effect with your air compressor to pull the system under vacuum, then you close the valve, disconnect the hose and install the inflation hose. Submerge the charge hose in a jug of coolant and open the valve to allow coolant into the system. When the level nears the end of the hose, close the valve, pour a new gallon into the hose and continue loading. Works perfectly! The only downside is that sometimes it's not easy to tighten the clamps (as instructed in the instructions, DO NOT grab the gauge), but since you're pulling vacuum, not pressure, it doesn't need to be too tight anyway. Used it at my buddy's shop and all he could say was "wow".
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