Backup Sump Pump Star Water Systems submersible backup sump pump protects your home by relocating overflowing water if your primary system fails Vertical float switch automatically turns pump on when water reached a preset point in the sump basin Thermoplastic construction ensures durability Powered by water, eliminating the need for electricity Operates on city water during power outages for peace of mind Comes fully assembled, making installation a breeze 16-GPM pumping capacity removes up to 2-gal for every gallon supplied. Works with any brand of sump pump for your convenience