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NEW Nilfisk Hot Pressure WashersPressure WashersMachine Parts by BrandPumps & SparesPopular High Pressure HosesHose ReelsNozzlesPressure Washer TriggersUnloader ValvesInterpump Service KitsBrass female threaded pipe couplings for joining two male threaded pipes or fittings in low pressure water and chemical pipework. Equal pipe couplings and reducer pipe couplings, which join two different thread sizes, are both listed in several sizes. Check the thread sizes on each product page using our BSP thread size chart.