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NEW Nilfisk Hot Pressure WashersPressure WashersMachine Parts by BrandPumps & SparesPopular High Pressure HosesHose ReelsNozzlesPressure Washer TriggersUnloader ValvesInterpump Service KitsA throttle control valve drops an engine-driven pressure washer to idle when the trigger gun is released and brings it back up to speed when you start spraying, saving fuel and reducing engine and pump wear.
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