Open: 24 hours 7 days a week
 
Characteristic: imperial threads.
Series II: Jaguar Saloon from 2R3923 and 2R53903, Daimler Saloon from 2K2197 and 2K50091, Vanden Plas from 2P1873 and 2P50056, Jaguar Coupe from 2G1015 and 2G50001, Daimler Coupe from 2F1004 and 2F50002
Series III: to VIN 312652.
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Power steering pump - Series II from May 1975, Series III to January 1980 (fuel injection cars)