WASTECORP. now offers helical gear reducers, replaceable bronze inserts on all plunger pump series. Plunger Pumps Centrifugal Pumps Diaphragm Pumps Pump Parts Spec a WASTECORP. Plunger Pump For your Next Job Ownership of the Marlow Plunger Pump line has changed hands throughout its 75 year history, In 1993, Wastecorp. Inc., purchased the ITT Marlow Plunger Pump division of ITT Fluid Technology.