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<blockquote data-quote="KennyO" data-source="post: 8125940" data-attributes="member: 822"><p>The guy told me, a couple of years ago now, that a mechanical non return valve was not enough, because it could fail without anyone knowing. They want a clear air gap between mains water source and any troughs. Proper troughs always overflow before the water inlet is submerged.</p><p></p><p>We had an old bath made into a trough so had to Stihl saw a vee into the end of it so it would overflow. The problem they have with hoses is they can be left running into a trough and then back Syphon if there is a burst no like was pointed out above.</p><p></p><p>He was very happy cause most of our troughs are supplied from a large header tank and said this would be their ideal situation.</p></blockquote><p></p>
[QUOTE="KennyO, post: 8125940, member: 822"] The guy told me, a couple of years ago now, that a mechanical non return valve was not enough, because it could fail without anyone knowing. They want a clear air gap between mains water source and any troughs. Proper troughs always overflow before the water inlet is submerged. We had an old bath made into a trough so had to Stihl saw a vee into the end of it so it would overflow. The problem they have with hoses is they can be left running into a trough and then back Syphon if there is a burst no like was pointed out above. He was very happy cause most of our troughs are supplied from a large header tank and said this would be their ideal situation. [/QUOTE]
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