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I have an inground sprinkler system with 3 zones.

The water line coming up from the basement is going to the valves and has a Wilkins backflow preventer on it. I am adding 2 new valves/zones for drip irrigation. According to my research, I need to put a backflow preventer on those 2 new zones.

My question is, if I have one on the main waterline feeding the zones do I really need to put 2 more on the 2 new zones? The backflow preventer gets screwed on to the valve followed by a water filter and then a pressure reducer.

isherwood
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Robusto
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1 Answers1

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The instructions probably state the need for backflow prevention assuming there is none existing. ( probably legally motivated)

If you have backflow prevention on the main line to the system manifold or line to the valves then you do not need any other backflow prevention.

RMDman
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