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<blockquote data-quote="roys" data-source="post: 463836" data-attributes="member: 5044"><p>Just out of interest and trying to understand need for check valve, how can water sitting in hose get back into the mains system.</p><p></p><p>I am guessing mains water is at 3 bar which means that somehow the garden hose would have to be higher than 30 meters to have a head of pressure greater than 3 bar.</p><p></p><p>What am I missing is it if the mains water ever fails and the water hose is up a bit to overcome a failed mains pressure?</p></blockquote><p></p>
[QUOTE="roys, post: 463836, member: 5044"] Just out of interest and trying to understand need for check valve, how can water sitting in hose get back into the mains system. I am guessing mains water is at 3 bar which means that somehow the garden hose would have to be higher than 30 meters to have a head of pressure greater than 3 bar. What am I missing is it if the mains water ever fails and the water hose is up a bit to overcome a failed mains pressure? [/QUOTE]
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