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401M Flexible Impeller Pumps

Oberdorfers 401M models feature high quality bronze construction along with 303 grade stainless steel shafts in order to maximize corrosion resistance. Ball bearings and mechanical seals are found on top of the line models, while others have bronze or carbon bearings and lip type seals. Optional nitrile impellers are available, with neoprene rubber as standard. Flexible blades on the periphery of the impeller provide the pumping action. Impellers rotate the liquid between the blades and is continuously squeezed out into the discharge port by a machined in cam located inside the pump chamber.