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Hi Angus,

Using a pressure reducing valve can lead to extra maintenance challenges.

I, instead,the a break-pressure tank used has sufficient volume, it can also act as a local service reservoir, and with greater volume emergency storage. Providing such storage near to the end of the extension pipe will mean that the supply pipe diameter to it can be smaller. This will be because it will not need to take the peak flow rate; if sufficient storage were provided it could be designed even for the average 24-hr flow rate!

Best regards,

Brian