Sump Pump Submersible Water Pump 4500GPH High Flow with Adjustable Float Switch to Drain Clean/Dirty Water for Pool Garden Pond Hot Tub Flooded House Rain Barrel. Powerful Pump with Stable Performance? This item is constructed of hi-impact corrosion resistant plastic, sump pump moves up to 4500 gallons per hour tackles any draining job at a fraction of the time. Automatic Float Switch? Start/stop automatically. When water level is below 1-1/2 inch, it will automatically disconnect the power; when water level rises above 7 inch, the pump will start again. Manual Water Pump? When the float switch is locked on the pump, the pump will work all the time and the power will not shut off automatically, cut off immediately when the pump fails to pump water to prevent from dry running. Easy to Connect Hose? 3 different diameters outlets NPT 1-1/2 inch, GHT 3/4 inch, Dia. 1-1/2 inch to adapte for different size hoses as needed according to the flow rate. The bigger the flow is, the wider the outlet should be. This item is not suitable for working with expandable hoses. Application Occasions? Ideal for draining both clean/dirty water from any enclosing environment, such as cellars, reservoirs, flooded basements, flat roofs and more, but not for applications involving corrosive or flammable liquids. This sump pump with a suction screen at the bottom can whisk away water to 1-1/2 inch from the floor and allows to pass 1/5 inch grains under clean water application. Customer First? One satisfaction ensured.