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Oberdorfer has perfected the gear pump by leading the industry in quality and innovation. Oberdorfer offers internal and external gear pumps which utilize rotating cogs to transfer fluids. External gear pumps are designed with two gears of the same size, rotating opposite of each other and pushing the liquid to either side before joining back up at the output. Internal gear pumps feature a gear within a gear, both rotating the same way with the outer gear driving the inner (idler) gear. The most common applications for the gear pumps are high viscosity fluids and harsh liquids as well as resins, chemicals, oils, ink, solvents, food products and more.