A progressive cavity pump uses a set of fixed shape small cavities, which transfer the fluid through the pump as the rotor is turned. Progressive cavity pumps have a flow rate which is directly proportional to the rate at which the rotor is rotated. The use of overlapping cavities, which taper towards the end, means that there is no pulsing flow effect caused by the pumping of the fluid. Progressive cavity pumps are used in many different commercial situations including the oil industry. Home uses for progressive cavity pumps could include water supply from wells, rivers and streams, irrigation and garden sprinkler systems, cess pit or septic tank emptying and cellar drainage. Progressive cavity pumps can also be used for light commercial usage in pumping diesel, chemicals, vegetable oils and water based ink.

There are several manufacturers of progressive cavity pumps including Mono where the name Mono Progressive Cavity pump is derived from. Mono is world renowned for their production of cavity pumps and is the leading provider in the distribution, manufacture and design of progressive cavity pumps. Mono pump spares are available for all mono pump parts and pumps can generally be fixed relatively easily. The main mono spares include rotor and stator kits, seals, coupling kits, barrel and pump bodies. Progressive cavity pump spares can also be ordered to replace the main cavity pump motor, with varying power outputs available. Hardware kits are available for all types of cavity pumps. Mono spares are built and designed to the same high quality as the progressive cavity pumps themselves.