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NEW Nilfisk Hot Pressure WashersPressure WashersMachine Parts by BrandPumps & SparesPopular High Pressure HosesHose ReelsNozzlesPressure Washer TriggersUnloader ValvesInterpump Service KitsST550 foot operated valves rated at 500 bar, used as a dead man control to start and stop the high pressure water flow in industrial cleaning, leaving both hands free for the lance. Two ST550 foot valves are listed, part numbers 200550600 and 200550620. Check the inlet and outlet connections on each product page before ordering.