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NEW Nilfisk Hot Pressure WashersPressure WashersMachine Parts by BrandPumps & SparesPopular High Pressure HosesHose ReelsNozzlesPressure Washer TriggersUnloader ValvesInterpump Service KitsBrass reducing bushes with a male thread on the outside and a smaller female thread on the inside, for stepping down a thread size in low pressure water and chemical pipework. Nine sizes are listed under part numbers 1-73190 to 1-73280. Check both thread sizes on each product page using our BSP thread size chart.