This open ball bearing (Part #20013403) is made for the Leybold Ruvac WS501 vacuum pump. The bearing supports the rotating shaft inside your pump. It keeps everything spinning smoothly and reduces friction. A direct replacement that fits perfectly.
Fits these pump models exactly:
Leybold Ruvac WS501
Also compatible with WSU501 models
This bearing works with many Leybold Ruvac models :
WA150, WA250, WA500
WAU150, WAU250, WAU500
WA151, WA251, WA501
WAU151, WAU251, WAU501
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