Made to last, the Delavan 5940-111C PowerFLO Electric Diaphragm Pump (Bypass) is corrosion-resistant and highly versatile, allowing for many different functions. The pumps are self-priming and feature five-chamber positive displacement. This sturdy model is made to last with rugged materials such as Polypropylene, Santoprene, Viton, stainless steel and coated steel, and the weatherproof electric connector increases this model's safety factor.