OTS (Off the Shelf) is a program operated by The Gorman-Rupp Company that offers a complete line of small pumps, including self-priming, straight centrifugal, diaphragm, submersible, mag drive, peristaltic, bellows, gear and piston models. Drive options include engines, electric motors or basic pedestal configurations.

Manufacturers and brands represented by OTS include AMT, IPT, Gorman-Rupp Industries and The Gorman-Rupp Mansfield Division.

Over 600 models are available in 2 weeks or less and 200 models are available Off the Shelf.