• Unvented hot water storage vessel

    A hot water storage vessel that does not have a vent pipe to the atmosphere. Interpretation given in Schedule 2: of the Water Supply (Water Fittings) Regulations and Scottish Water Byelaws read more

  • Upstand - Backflow prevention device

    An "upstand" means either one of two alternative arrangements of water fittings to prevent backflow by backsiphonage: Type A upstand - An upward flowing supply or distributing pipe surmounted by an anti-vacuum valve (Type DA), or an anti-vacuum read more