If you are planning to install a type BA device – Verifiable Backflow Preventer with
Reduced Pressure Zone (RPZ Valve) then you need to get permission from us
before you start.

RPZ valves - commissioning and site testing of Type BA Device

• Commissioning and site testing of a Type BA Device (Reduced Pressure Zone valve) assembly must be carried out by an approved RPZ tester.
• Testing must be carried out at intervals not exceeding 12 months.
• On completion of a site test, a test report certificate must be completed by the tester with copies submitted to the water supplier and the person responsible for the device.
• Please note, Type BA Devices will only give backflow protection up to fluid category 4.