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NEW Nilfisk Hot Pressure WashersPressure WashersMachine Parts by BrandPumps & SparesPopular High Pressure HosesHose ReelsNozzlesPressure Washer TriggersUnloader ValvesInterpump Service KitsComet 1 3/8 inch torque arm and quick coupling kits for connecting Comet diaphragm pumps to a PTO shaft, listed under part numbers 5002000300, 5002000800 and 5002001700. Check the part number against your pump model before ordering.