Automatically turns on after the water starts, and shuts off when the water is removed. Activated by a Rule-A-Matic float switch. Available in two pump capacities - 500 gph and 800 gph. The 500 model has one 1-1/2" inlet port. The 800 models have three inlet ports which offer varying combinations of inlet hose. Other features include a clear screw down, cover, removable strainer for easy cleaning, and an internal check valve to prevent back siphoning.