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