A method of installation approved by the water undertakers (water suppliers) under Regulation 4 of the Water Supply (Water Fittings) Regulation/Scottish Water Byelaws. Regulations 4 (6) & 12 of th [..]

"An air gap" means a visible, unobstructed and complete physical air break between the lowest level of water discharge and the level of potentially contaminated fluid downstream (critical wa [..]

A person who– (a) has been approved by the water undertaker for the area where a water fitting is installed or used, or (b) has been certified as an approved contractor by an organization specified in [..]

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) Regula [..]

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 o [..]

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 diffe [..]

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 e [..]

A universally used unique numerical identifier allocated to a chemical substance by the Chemical Abstracts Service (CAS). A CAS Registry Number itself has no inherent chemical significance but provide [..]

A fixed container for holding water at atmospheric pressure. Interpretation given in Schedule 2: of the Water Supply (Water Fittings) Regulations and Scottish Water Byelaws read more

A cistern for supplying cold water to a hot water system without a separate expansion cistern Interpretation given in Schedule 2: of the Water Supply (Water Fittings) Regulations and Scottish Water By [..]