​RPZ FAQs: General

What is an AIM?

An installation method (AIM) is a procedure approved by Water undertakers.

The current version of the RPZ AIM, published in January 2020, is ‘AIM-08-01 Type BA device- verifiable backflow preventer with reduced pressure zone valve (RPZ)’. It provides procedures for both installing and testing of RPZ valves. It is approved the water undertakers in England, Scotland, Wales and Northern Ireland listed on page 2.


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Uncontrolled if downloaded. This is informative, non-statutory guidance and intended for general guidance purposes only; it is subject to change.

Compliance with this information should not be relied upon as guaranteeing no enforcement action will be taken by water undertakers. Water Regs UK accepts no liability for loss, indirect or consequential loss arising from or in connection with this guidance document.