About This Product Wayne Battery Backup Sump Pump with Automatic Switch, 48 gpm, Maximum Lift Head: 15 ft, Outlet Connection Size: 1-1/2 in, 12 VDC, Cord Length: 8 ft, Impeller Material: Thermoplastic, Housing Material: Steel/Cast Iron, Installation Type: Submersible, Includes: Protective Battery Case Highlights Fully submersible backup pump, for an easy addition to any sump system Corrosion-resistant thermoplastic impeller for maximum water flow Protective battery case included with LED display and audible alarm to let homeowner know there's a problem 1-1/2 in NPT discharge for easy installation and compliance with building codes This ultra quiet pump is expertly engineered and assembled to be the hardest working pump you'll never hear This pump is assembled in the USA to deliver dependable performance that lasts for years Protects your basement with hours of pumping power when the electricity goes out (SUMP PUMP 12 VOLT BACKUP - 3179991 - ESP25)