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how to fit new diaphragm?

The diaphragm has gone, can't think why, the whole brass unit that it's in is quite new.
Is this difficult, should I get a professional?
Oriole, January 2013
3rd step, get a qualified person to repair your boiler!
if you have to ask how then you really shouldn't touch it!

bill, January 2013
1st step, tell us what you're on about, 2nd step repost your question again, but with more info this time.Simples!

A M, January 2013