Model 81 1/4B3-E.33 1P is designed for applications requiring high volume, low pressure, sump or liquid transfer. The copper alloy semi-open impeller handles solids to 5/16" diameter. Builtin flapper/check valve enables consistent self-priming to 20 ft. Included with the pump are a suction strainer, float switch, and an eight foot power cord. Motor is 1/3 horsepower.