Springer is a distributor of Classic rotary lobe pumps. The Classic is a positive displacement design suited to continuous and intermittent transfer or process applications. Classic rotary lobe pumps can pump in either direction, have a wide displacement range, positive self priming action, and can run dry with a suitable seal.

Tri-Rotor has been a manufacturer of positive displacement rotary piston pumps for over 80 years. Rotary pumps come ranges of up to 20 GPM to 220 GPM. The 30 GPM models can either be foot mounted or close coupled.

Halsted & Hoggan are distributors of Hypro roller pumps designed for agricultural and industrial spraying and transfer of a variety of fluids. The rotary action of these roller pumps requires no check valves and provides positive displacement with less friction and lower starting torque than other pumps.

Tramco is a manufacturer and distributor of many different pump styles, including internal and external positive displacement rotary gear pumps with 1500 GPM capacity, API 610 rotary gear pumps, and internal, external, bi-rotor, and tri-rotor positive displacement pumps with 1,500 GPM capacity.

APT manufactures continuous rotary gear pump systems. Their SRD Series system meters, mixes and dispenses unfilled cast urethane elastomers, epoxies and vinyl esters. Each of the positive-displacement rotary gear pumps on the SRD Series system is driven with a digitally-controlled servomotor drive.

The Kraissl Co. are manufacturers of positive displacement oil transfer pumps and rotary air pumps.