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Vaillant VCW sine_18 T3-wax capsule?

Can anyone tell me where the wax capsule is located in this boiler & provide me with a brief description on how it should be replaced?

JB
August 2007
VaillantHeating, Home Heating SystemsVaillant Located Boiler
it is inside diverter next to secondary heat exchanger, all this part alos attached to flow,incoming from boiler and by pass pipes, connected.

jay.
December 2010

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