1 x 8340. A New XK120 Later design of pump, known as the Whitely Design water pump (with pressed on integral pulley & hub) and gasket. This design of pump has the improved, large, sealed inner bearing assembly  in the body rather than in the hub with a weak, narrow neck that can stress and break. It's not uncommon for a water pump to become faulty - the classic XK's are prone to over-heating as it is such a long engine to pump water along. Original Jaguar part number Ref. C6746. C6746/1

We can also supply new  thermostats SEE : 8011

New Thermostat housings are also available - search our shop for part number SEE : 8000

For Bypass and Heater Fittings SEE : XK120 Waterpump Fitting