i rarely see people talk about this, but i guess its kinda expensive just to have. but i do use it for work, so just to let peoples know... this thing is awesome, never have had an overheating issues when using this, and its so fast as well. what it does is pull a vacuum on the whole cooling system, and if there are no leaks then all/most air is sucked out and vacuum will draw coolant into the system without air pockets. good stuff!
swirl pots are good too :P