The Wayne ESP25 is a battery backup sump pump system made of corrosion-resistant reinforced thermoplastic. It can pump up to 3,300 GPH @ 0'. The Wayne ESP25 professional grade 12-volt backup system has a reliable reed float switch for automatic operation and will keep the battery properly charged. Made with an alarm that lets the homeowner knows it is active and designed for easy installation, this system can be used by any DIY or Professional.