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NEW Nilfisk Hot Pressure WashersPressure WashersMachine Parts by BrandPumps & SparesPopular High Pressure HosesHose ReelsNozzlesPressure Washer TriggersUnloader ValvesInterpump Service KitsBrass male threaded nipples for joining two female threaded fittings in low pressure water and chemical pipework. Equal nipples are listed under part numbers 1-73010 to 1-73060, and reducer nipples, which join two different thread sizes, under part numbers 1-74001 to 1-74006. Check the thread sizes on each product page using our BSP thread size chart.