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NEW Nilfisk Hot Pressure WashersPressure WashersMachine Parts by BrandPumps & SparesPopular High Pressure HosesHose ReelsNozzlesPressure Washer TriggersUnloader ValvesInterpump Service KitsFlojet Triplex HP Series demand pumps with a built-in pressure demand switch set at up to 10.3 bar. The range covers the 12V R3711133A, R3711143A and R3811143A and the 24V R3711343A, with Viton, EPDM and Santoprene seal options. Check the part number of your existing pump before ordering a replacement.