These pumps operate smoothly and with equal efficiency in either direction of operation when the relief is in the proper position. They efficiently handle heavy, viscous materials such as asphalt, molasses, roofing compounds and printing inks; as well as fuel oils, gasolines and similar thin liquids. Standard features include thrust control and adjustable rotor clearances to compensate for wear and viscosity.

Pumps are available in several materials of construction with or without relief valves. Pumps can be supplied with conventional packing or mechanical seal.