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<blockquote data-quote="roys" data-source="post: 463846" data-attributes="member: 5044"><p>Good link [USER=17152]@Sharpend[/USER] so by reading it, it looks like as suspected there has to a dramatic loss of supply pressure or even a vacuum at supply due to maintenance in order for back flow to occur.</p><p></p><p>There must be thousands of hoses connected without check valves, including my own, but I guess you just never know when the mains water is going to go into vacuum and suck all the water out of your garden hose <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> mmmmmm.</p></blockquote><p></p>
[QUOTE="roys, post: 463846, member: 5044"] Good link [USER=17152]@Sharpend[/USER] so by reading it, it looks like as suspected there has to a dramatic loss of supply pressure or even a vacuum at supply due to maintenance in order for back flow to occur. There must be thousands of hoses connected without check valves, including my own, but I guess you just never know when the mains water is going to go into vacuum and suck all the water out of your garden hose :) mmmmmm. [/QUOTE]
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