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NEW Nilfisk Hot Pressure WashersPressure WashersMachine Parts by BrandPumps & SparesPopular High Pressure HosesHose ReelsNozzlesPressure Washer TriggersUnloader ValvesInterpump Service KitsUdor piston ring kits for Udor plunger pumps, including brass ring kit 18 and brass ring kit 19. Check the kit number in your pump's parts list to choose the correct kit.