Our range of Fluid Category 5 AB Air Gap Water Tanks meet and comply with the Water Supply (Water Fittings) Regulations 1999 in England and Wales and the technically identical Scottish Water Byelaws 2004. The installation and use of cold water storage cisterns and sectional tanks connected to the public water supply must comply with these conditions. This potable tank is WRAS (Water Regulations Advisory Scheme) approved. This break tank is supplied with the screened overflow and weir installed to meet the requirements of WRAS Fluid Category 5 Break Tanks. These WRAS Approved Water Tanks have the option of adding insulation to the tank, either 13mm or 25mm.