Backflow prevention device (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Backflow prevention device" in English language version.

refsWebsite

Global rank English rank

1absolutedp.com

low place

low place

4,084^th place

2,686^th place

1web.archive.org

1^st place

1^st place

absolutedp.com (Global: low place; English: low place)

"Backwater Valve Installation". Absolute Draining & Plumbing. Retrieved 9 October 2014.

opsi.gov.uk (Global: 4,084^th place; English: 2,686^th place)

"The Water Supply (Water Fittings) Regulations 1999". Archived from the original on 23 August 2010. Retrieved July 26, 2010.

web.archive.org (Global: 1^st place; English: 1^st place)

"The Water Supply (Water Fittings) Regulations 1999". Archived from the original on 23 August 2010. Retrieved July 26, 2010.