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where can I buy the tool to adjust the system pressure?

I have a Worcester 28cdi installed 3yrs ago and surprise surprise the installer never left the tool that comes with the boiler. So I now have the problem of getting one (as advice from this site suggests pressure adjustment will solve the problem)
Chris Henderson, December 2006
Visit your local plumb merchants or boiler spares shop and they will be able to supply a filling key for the appliance.

GasAid.co.uk, December 2006
link Click here to see other fixes for Worcester.