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NEW Nilfisk Hot Pressure WashersPressure WashersMachine Parts by BrandPumps & SparesPopular High Pressure HosesHose ReelsNozzlesPressure Washer TriggersUnloader ValvesInterpump Service KitsAISI 316 stainless steel male threaded nipples for low pressure water and chemical pipework. Equal nipples are listed under part numbers HN08 to HN32, and reducer nipples, which join two different thread sizes, under part numbers RN0806 to RN3224. Check the thread sizes on each product page and confirm them using our BSP thread size chart.