Channeled and ported ring installed between packing rings in stuffing box which creates a passage for shaft lubrication.

Shaft that connects the drive end of the pump with the rotor. Also available in auger type to help feed products into the stator cavities.

Short for Ethylene-Propylene Terpolymer. This is a type of elastomer.

A mechanical assembly used to seal a shaft where it passes through a mechanical opening.

A unit of length equal to one thousandth (103) of a millimeter or one millionth (106) of a meter.

A unit of length equal to one thousandth (103) of a millimeter or one millionth (106) of a meter.

Short for Acrylonitrile Butadiene rubber. Commonly known as Buna N.

Pump principle by which a rotor (usually metallic) turns within a stator (usually elastomeric). As the rotor turns, cavities are opened and closed progressing the product to the pump discharge.

The helical shaped rod that rotates within the stator.

Ability of the pump to automatically prime itself.