THE BASEMENT WATCHDOG Model BW4000 1/2 HP Combination Submersible Sump Pump with Cast Iron / Cast Aluminum Primary Sump Pump and Special CONNECT Battery Backup Sump Pump System (This Item Has Been Discontinued by the Manufacturer - See Replacement Model CITS-50) Product Description The Basement Watchdog Big Combo is a pre-assembled energy efficient oe HP Cast Iron / Cast Aluminum primary pump combined with the Basement Watchdog Special CONNECT Battery Backup Sump Pump System. With two pumps in your sump pit, you will know your basement is protected. Easy to install with little or no plumbing knowledge required, you can feel safe that The Basement Watchdog is WATCHING OUT FOR YOU! From the Manufacturer Combination Primary and Battery Backup Sump Pump System Includes a Basement Watchdog AC pump and a Basement Watchdog battery backup system. Already assembled for easy installation. Compact footprint fits in any size sump pit. Dual float switches provide dependable activation for each pump. Unique monitoring controller sounds an alarm if maintenance is needed. Battery and acid sold separately. The Basement Watchdog Combination sump pump system is designed to provide both primary and backup pumping capabilities. The primary pump will operate as long as it is receiving AC power. If the power is interrupted, or more water is coming into the sump than the AC pump can handle, the backup sump pump will begin pumping automatically. The backup system has unique monitoring features that diagnose a problem and sound an alarm. A light on the display panel of the control unit will indicate the cause of the alarm and the corrective action. Pre-assembled for easy installation. Back-up GPH @ 10-Feet - 1730 GPH, Primary GPH @ 10-Feet - 3200 GPH. Batteries sold separately. Acid cannot be shipped, must be purchased locally. Features Package contains: Controller, charger, two dual micro reed float switches, primary pump and backup pump, instruction manual (battery and acid sold separately) Back-up starts immediately after loss of power or if flow of water is too great for the AC pump alone Back-up features unique monitoring systems to diagnose problems and sound an alarm Compact, fits in pits as small as 12-Inch in diameter. USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.