Leybold Drive/Auxilliary Impeller Shaft for Ruvac WAU 251 Blower Vacuum Pump.
Leybold Part Number: E20014408.
This is an Leybold OEM drive impeller shaft for the Leybold Ruvac WAU 251 roots blower pump. Also known as the auxilliary or follower impeller shaft. Please see the exploded view (2nd image). Please see part number P1012427 for the driven (powered) impeller shaft.