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It's quite a difficult one, you take the front portion of manifold off (after undoing it's attachments) New large diaphragm doesn't always fit good or seal good even though supplied by Vokera. Wrong gland for the front manifold which you took off usually supplied by vokera, there must have been variations in the past, and the kit they now supply doesn't quite work. You do get a little o ring though which is nice.
You're advised to do the smaller primary flow sensing diaphragm and bits and pieces over on the left of the boiler also.
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