Wessex Water Services Ltd, Registered in England No. 2366648 Registered Office: Operations Centre , Claverton Down Road, Claverton Down, Bath BA2 7WW.

The 975XL Reduced Pressure Principle Backflow Assembly is used on non-potable water applications for high health hazard protection from both backsiphonage and backpressure of contaminated water into the potable water supply. The wye pattern design with short lay length eases installation in compact spaces, and the cast bronze body includes separate access to the relief valve and each check valve for reduced labor costs and repair time. The 975XL is favored by installers around the world, and is the simplest, best performing, and most reliable backflow preventer in the irrigation market today. Assembly shall provide protection where a potential health hazard exists. For non-potable applications only.

We have 10 working days from the receipt of a formal notification to grant consent for the installation of the RPZ valve.

All test failures must be reported to us within at least 24 hours. Please email us at RPZ@wessexwater.co.uk and include details of the failure and the planned actions and associated timescales to resolve the issue.

Our regulations officers may require a site visit to inspect the RPZ to confirm it has been installed in accordance with the AIM document.

If we do not receive a passed test certificate from an approved tester within 14 working days of the due date of the test, we will attempt to contact the premises owner or person responsible for the RPZ valve.

Our last available resort will be to switch off the water supply to the premises until a passed RPZ test certificate has been received.

All test certificates must be emailed directly to us at RPZ@wessexwater.co.uk within 10 working days of the test being carried out.

Reduced Pressure Zone (RPZ) valves are installed to prevent the backflow of fluids that represent a significant health hazard (fluid category 4).

The RPZ valve and fitting(s) it supplies must remain isolated until the RPZ valve can be repaired or replaced. The supply to the valve must not be reinstated until a satisfactory test pass is achieved.

If you are experiencing an issue with our services or require additional support, see our advice and discover how we can help.

RPZ valves must be tested at a minimum of every 12 months unless a more regular frequency is required by the water undertaker.

You can do this by completing a notification form and emailing it to us at Regulation5.Notification@wessexwater.co.uk or sending it by post to Wessex Water, Regulation 5, Developer Services, Claverton Down, Claverton, Bath BA2 7WW.

If the risk is considered to be significant due to the nature of the water use at the premises, a regulation officer will be arranged to visit and assess the risk. As a last resort, the water supply to the premises may be switched off until the issue with the RPZ valve can be resolved.

If we do not receive any response a regulations officer will be arranged to visit the premises and carry out an inspection to assess the risk. The visit will also involve agreeing on a mutual resolution to the problem where possible.

A letter advising the test is overdue and must be carried out at the earliest opportunity will also be sent to the property.

Before installing an RPZ valve in premises already connected to the mains water supply, you must notify us first. This applies to all new RPZ valves, even if there are others already installed.

The 975XL Reduced Pressure Principle Backflow Assembly is used on non-potable water applications for high health hazard protection from both backsiphonage and backpressure of contaminated water into the potable water supply. The wye pattern design with short lay length eases installation in compact spaces, and the cast bronze body includes separate access to the relief valve and each check valve for reduced labor costs and repair time. The 975XL is favored by installers around the world, and is the simplest, best performing, and most reliable backflow preventer in the irrigation market today. Assembly shall provide protection where a potential health hazard exists. For non-potable applications only.

Once approval has been granted for the installation of the valve, it must be installed by an approved, registered contractor and in accordance with the Water Undertaker's Approved Installation Method (AIM) document.

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