Hi, I'm trying to find a suitable expansion vessel for a borehole pump, the grundfos 4Block pump 4" model. Could any of you guys recommend a make and model?
Borehole pump question
- Thread starter sammy1990
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It is not an expansion vessel you require, it is a Hydronic Accumulator which must be fitted with a membrane suitable for potable water ask a local pump servicing company for advice on type and size 
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