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NEW Nilfisk Hot Pressure WashersPressure WashersMachine Parts by BrandPumps & SparesPopular High Pressure HosesHose ReelsNozzlesPressure Washer TriggersUnloader ValvesInterpump Service KitsMarco gear pumps are compact positive displacement pumps that use rotating gears to move fluid. Often self-priming, they are used for spraying, chemical transfer, water systems and fuel and oil handling in agriculture, automotive, marine and industrial cleaning applications.