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NEW Nilfisk Hot Pressure WashersPressure WashersMachine Parts by BrandPumps & SparesPopular High Pressure HosesHose ReelsNozzlesPressure Washer TriggersUnloader ValvesInterpump Service KitsStainless steel quick release couplers and adaptors with a 17.8mm plug for soft wash guns, lances and hoses. The range includes ARS178L couplers and adaptors with 1/4, 3/8 and 1/2 inch BSP male or female threads, ARS178P couplers with a blue cover in 1/2 inch male or female, and AKBO stainless steel QR couplers and adaptors. Check threads with our BSP thread size chart.