Home Guard Optima emergency sump pump backup system is a high-capacity, high-efficiency water powered backup system. No electricity or batteries required - takes over when primary sump system fails. Comes fully assembled. Can be used with any existing brand of sump pump. Small footprint allows for installation in the smallest sump pits. Uses less water and costs less to operate. Municipal/city water pressure powered system. Removes up to 2 gallon per gallon used. Includes push-to-connect supply fitting (field installed). Performs at 80 P.S.I. PVC construction with corrosion-resistant stainless steel float rod for maximum dependability. Some districts may require a reduced pressure principle backflow preventer per ASSE Standards 1013. Check local codes.