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 a City & Guilds accredited tester who has been approved by the water supplier as competent to test Type BA Devices
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.