Cite
HARVARD Citation
Institution,, B. (2020) Devices to prevent pollution by backflow of potable water. Hose Union anti-vacuum valves. DN 15 to DN 25 inclusive Family H, type B and type D. General technical specification.. [Online]. London : British Standards Institution. Available from: http://access.bl.uk/ark:/81055/vdc_100105482527.0x000001