Never liked using vacuums on drain lines. I use a Rehvac MBK-6 to clear the line, and the Auxipump to pump the water out of the Aux pan right into the main drain. I modified the auxipump to be able to run from the power supply that is included but also from a 3 cell 2,500mah Lithium polymer battery pack. The battery is great for those times no outlet is close to the unit and would need an extension cord. I can empty out about 10 Aux pans on one charge While it was a bit pricey, both are some of the best tool purchases I have made.