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Where can I find the GC NUmber?

I need to replace the diaphragm on my Main Medway Super water heater but can't find the GC NUmber. Can anyone help please
J Seaton, July 2011
You might find it here...

http://www.homeheatingguide.co.uk/efficiency-tables.php?make=Main

Peccavi, July 2011