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zilmet z160 expansion vessel pressure?

Because I am on a water meter I have a zilmet z160 expansion vessel fitted to my cold water main to reduce the pressure shock when turning the taps on and off. What pressure should I recharge the air side of the vessel too.
Robbie, January 2010
the spec says 3.5 bar

robin, October 2012
29 psi or 2 bar

Gonçalo Carvalho, February 2010