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This is the shaft sealing ring for Becker U Series vacuum pumps. Part number 90652800000 fits right on the pump shaft where it comes out of the housing. It stops oil from leaking out along the spinning shaft. It also keeps air from getting sucked in. If you see oil dripping from the front of your pump, this is likely the part you need. It fits many U4.70 and U4.100 models.
