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    • Guidance
      • General Overview
      • Notification Overview
      • Regulation 4(1)(a) & 4(2) Overview
      • Backflow Overview
      • Installers Overview
      • Bathroom Backflow Risks
      • Cold Water Storage
      • Hose Union Taps
      • Specific Installation Guidance
      • RPZ FAQs
      • Water Quality FAQs
      • Contact Details for Water Undertakers
      • Your Feedback
    • Information
      • The Water Fittings Regulations & Byelaws
      • The Regulators' Specifications
      • Relaxations
      • Glossary
      • FAQs
      • Publications
      • Calculators & tools
      • Videos
      • Case studies
    • Installers
      • RPZ valves: installation, testing and testers
      • WaterSafe
      • Quiz
      • Find an approved installer
    • WIAPS
      • Get Approved - how do I join?
      • Membership renewal
      • Work Compliance Certificates
      • WIAPS FAQs
      • Search for WIAPS Installer
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    • Home
    • Guidance
      • General Overview
        • What are the Water Supply (Water Fittings) Regulations/byelaws in Scotland?
        • Who has to comply?
        • Where and when do the Water Supply (Water Fittings) Regulations/ byelaws in Scotland apply?
        • Do the Water Supply (Water Fittings) Regulations/ byelaws in Scotland apply retrospectively?
        • Who enforces the Water Supply (Water Fittings) Regulations/ byelaws in Scotland?
        • How do you comply with the Water Supply (Water Fittings) Regulations/byelaws in Scotland?
        • What is a water undertaker?
        • Who is the Regulator?
        • What is a relaxation?
        • Help to install correctly
        • What is an approved contractor scheme?
        • What is an approved contractor?
        • Where can I find an approved contractor?
      • Notification Overview
        • What is notification?
        • What is meant by conditions of consent?
        • Where can conditions of consent be found?
        • What work needs to be notified in advance?
        • How to notify (England & Wales)
        • How to notify (Scotland)
        • How to notify (Northern Ireland)
        • What is a material change of use?
        • Notification by approved contractors (England & Wales)
        • Notification by approved contractors (Scotland)
        • Notification by approved contractors (Northern Ireland)
        • Notification of a pump or booster
      • Regulation 4(1)(a) & 4(2) Overview
        • What is a water fitting of an appropriate quality and standard?
        • What is meant by evidence of regulation 4(1)(a) compliance?
        • How will I know if a water fitting is suitable for installation?
      • Backflow Overview
        • What is backflow?
        • What is contamination?
        • What is a fluid category?
        • What is a backflow prevention arrangement or device?
        • Who assess backflow risks?
        • What form of backflow prevention should be installed as point of use protection?
        • What is the difference between point of use, zone and wholesite backflow protection?
        • Does zone or wholesite backflow protection have to be installed?
        • Backflow protection for premises on a common supply
        • Installation of mechanical backflow prevention devices
      • Installers Overview
        • What are approved contractor schemes?
        • What is an approved contractor?
        • What is an approved contractor sector scheme?
        • What is the difference between an approved contractor and a member of a sector scheme?
        • What is WaterSafe?
        • Notification by approved contractors (England & Wales)
        • Notification by approved contractors (Scotland)
        • Notification by approved contractors (Northern Ireland)
        • What is a certificate of compliance?
        • What is the position regarding accepting certificates of compliance?
        • Where can I find an approved contractor?
        • How do I confirm someone is a current member of an approved contractor scheme?
        • What approved contractor scheme can I join?
        • What qualifications do I need to join an approved contractor or sector scheme?
        • RPZ valve installation and testing
      • Bathroom Backflow Risks
        • Backflow protection in bathrooms
        • Toilets
        • Urinals
        • Combined WC bidets
        • Bidet showers adjacent to toilets
        • Bidets
        • Showers
        • Bath and basin taps
        • Spa baths
        • Assisted bathing
      • Cold Water Storage
        • General requirements
        • Cold water storage: cistern
        • Cold water storage: inlet valve
        • Cold water storage: outlet
        • Cold water storage: overflow and warning
        • Cold water storage: incorporating a Type AB air gap
        • Cistern size
        • Cold water cistern installation
        • Linking cold water storage cisterns
        • Protecting cold water storage cisterns from frost damage
        • Protecting cold water storage cisterns from undue warming
      • Hose Union Taps
        • What is a hose union tap?
        • Hoses fitted with a flow control device
        • Backflow protection
        • Categorisation of backflow risk
        • Hose union taps: examples of backflow protection
        • Hose union tap supplying watering systems
      • Specific Installation Guidance
        • Backflow protection
          • Alternative water sources
          • Appliances incorporating pumps
          • Fire suppression systems
          • High risk taps
          • Laboratories
          • Pre-rinse pot wash tap
          • Type AB air gap
          • Type AB air gap: unrestricted discharge from weir overflow
          • Underground storage
          • Use of filling loops
          • Wastewater and chemical toilet emptying points
          • Whitegoods
        • Pipework
          • Installing pipework
          • Relative positions of utility pipework
          • Concealed pipework
          • Pressure testing
          • Insulating pipework
        • Expansion
          • Accommodation of expansion
          • Expansion vessels: servicing valve
          • Water fittings accommodating expansion and pressure surges
        • General
          • Heat energy recovery/exchange systems
          • Multifunction taps
          • Stop valves
      • RPZ FAQs
        • RPZ FAQs: Notification
          • What is notification and why do I have to notify?
          • When do I notify the installation or relocation of an RPZ valve?
          • How do I notify the installation of an RPZ valve?
          • Do I still need to notify if I used an approved contractor?
          • Do all water undertakers use the same notification form?
          • What changes should be notified to the local water undertaker?
          • What is meant by conditions of consent?
          • What conditions of consent for RPZ valve installation can be expected?
          • Where can conditions of consent be found?
          • Where can the consent reference number be found?
        • RPZ FAQs: Testing
          • Why do RPZ valve need regular testing?
          • What is meant by due date?
          • Can a test interval be changed?
          • What happens if an RPZ valve is tested early?
          • What happens if an RPZ valve is out of test?
          • I cannot get a RPZ tester to test the RPZ valve(s) before the test due date, what should I do?
          • The test due date has passed, and I have not been able to get a RPZ tester to complete the test, what should I do?
          • What do I do if the RPZ tester will not issue the commissioning/compliance test report until their invoice is paid?
          • Who can test an RPZ valve?
          • What is meant by a competent RPZ tester?
          • Do you have to use someone who belongs to a RPZ tester scheme to test RPZ valves?
          • Our maintenance technician tests all our RPZ valves, but only these, can they become recognised on a site specific basis?
          • How do I become recognised as an RPZ tester?
          • Do you need to join an approved contractor RPZ tester scheme?
          • Where can I find a competent RPZ tester?
          • Where do I get my test equipment calibrated?
          • What is a commissioning test?
          • When is a commissioning test needed?
          • What is a compliance test?
          • When is a compliance test needed?
          • Do all water undertakers use the same test report forms?
          • What is the minimum information required in a test report?
          • What is a valid commissioning/compliance test report?
          • Can a water undertaker refuse to accept a test report?
          • What do I do if a commissioning/compliance test report is not accepted as valid?
          • If an RPZ fails any part of a compliance test does testing need to be completed?
          • What happens if an RPZ valve fails compliance testing?
          • What happens if an RPZ valve fails commissioning testing?
          • What do I do when a failed RPZ valve has been repaired?
          • What do I do if a failed RPZ valve has to be replaced?
        • RPZ FAQs: General
          • What is an RPZ valve?
          • What is an AIM?
          • Where can I find the RPZ AIM?
          • How do I know if I need an RPZ valve?
          • What is a fluid category 4 risk?
          • Where can an RPZ valve be installed as point of use backflow protection?
          • An RPZ valve is installed at premises I am responsible for, what do I need to know?
          • Thinking about installing an RPZ valve at premises you are responsible for, what you need to know
          • I have just received a letter telling me an RPZ valve needs testing - what does this mean and what do I have to do?
          • Who do I contact if I have any questions about RPZ valves?
          • Who can install an RPZ valve?
          • How should an RPZ valve be installed?
          • Who can remove an RPZ valve?
          • Where can I find further information about a water undertaker's RPZ valve policy?
      • Water Quality FAQs
        • WQ FAQs: Appearance of water
          • Why do I have a brown/black line in my plastic kettle?
          • Why does my water look cloudy?
          • Why is my water yellow?
          • Why is my water a shade of blue?
        • WQ FAQs: Taste and odour of water
          • Why does my water taste rancid or of rotten meat?
          • Why does my water smell stagnant or like sewerage?
          • Why does my water smell and/or taste of chlorine antiseptic or TCP?
          • Why does my water smell/taste earthy or musty?
          • Why does my water smell/taste of petrol, diesel or oil?
      • Contact Details for Water Undertakers
      • Your Feedback
    • Information
      • The Water Fittings Regulations & Byelaws
      • The Regulators' Specifications
      • Relaxations
      • Glossary
      • FAQs
      • Publications
      • Calculators & tools
      • Videos
      • Case studies
    • Installers
      • RPZ valves: installation, testing and testers
      • WaterSafe
      • Quiz
      • Find an approved installer
    • WIAPS
      • Get Approved - how do I join?
      • Membership renewal
      • Work Compliance Certificates
      • WIAPS FAQs
      • Search for WIAPS Installer
    • News
      • Latest News
      • Press Releases
      • newsletter (Water Regs UK)
      • Consultations
      • News Archive
    • About Us
      • Water Regs UK Team
      • Water Regs UK Board
      • History
    • Contacts
      • Contact Water Regs UK
      • Water Company Contacts
      • Contact WIAPS
      • Useful external links
    • Site Information
      • Twitter T&Cs

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