Glossary



  • Backflow

    Flow upstream, that is in a direction contrary to the intended normal direction of flow, within or from a water fitting. Interpretation given in Schedule 2: of the Water Supply (Water Fittings) Regulations and Scottish Water Byelaws read more

  • Backflow Prevention Arrangements

    Follow the links below to get definitions of each of the recognised backflow prevention arrangement. Air gap Tap gap Type AA air gap – air gap with unrestricted discharge Type AB – Air gap with weir overflow Type read more

  • Backflow Prevention Devices

    Please follow the links below to see definitions of each backflow prevention device: Type BA – Verifiable backflow preventer with reduced pressure zone Type CA – Non-verifiable disconnector with different pressure zones read more

  • BS 6920

    A British Standard in four parts, last updated in 2014, entitled ‘Suitability of non-metallic materials and products for use in contact with water intended for human consumption with regard to their effect on the quality of the read more