
This is a shaft seal (Part # 90653000000). The size is 50 mm across the outside, 72 mm through the hole, and 7 mm thick .
This small ring fits around the rotating shaft where it enters the pump body. Its job is to keep oil inside the pump and keep air outside.The shaft seal you need for the U4.400 and U4.630 pumps has part number 90653000000 . This seal is also included inside the Seal & Gasket Kit for U4.400D and U4.630D pumps (Part# 5490002670D)
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