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NEW Nilfisk Hot Pressure WashersPressure WashersMachine Parts by BrandPumps & SparesPopular High Pressure HosesHose ReelsNozzlesPressure Washer TriggersUnloader ValvesInterpump Service KitsThermal relief valves for pressure washers in 1/4", 3/8" and 1/2" male threads, including 63°C versions in 1/4" and 1/2". Check the thread size against our BSP thread size chart before ordering.