Wacker Neuson PSR1 500 Submersible Pump 110VDesigned to pump water to extremely low levels. The PSR1 500 is ideally suited for dewatering of flat concrete, like basement and factory floors. For use where a sump pump cannot be installed, and water must be almost completely removed. A check valve prevents back flow and allows the pump to be moved from location to location without losing its prime water. For restoration projects, the PSR1 500 eliminates the need for wet vacuum cleaning, requiring