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NEW Nilfisk Hot Pressure WashersPressure WashersMachine Parts by BrandPumps & SparesPopular High Pressure HosesHose ReelsNozzlesPressure Washer TriggersUnloader ValvesInterpump Service KitsST45 quick release couplings and plugs for pressure washer systems up to 600 bar. The range includes two ST45 quick coupling bodies with 1/4 inch male threads and an ST45 quick coupling plug with a 1/4 inch female thread. Confirm the rated working pressure of every component in your system before use.