Leybold Driven Impeller Shaft for Ruvac WAU 251 Blower Vacuum Pump.
Leybold Part Number: E20014407.
This is an Leybold OEM Driven (powered) impeller shaft for the Leybold Ruvac WAU 251 roots blower pump. Please see the exploded view (2nd image). Please see part number P1012428 for the drive/auxilliary/follower impeller shaft.