Backflow Preventor or CheckValve Needed For Rain Barrel System?

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gcxboxps

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I have a rain barrel system setup that has a transfer pump attached to the rain barrel that routes rain water through a PVC pipe to a spigot in my garden.
I also have another water connection coming from my home's outdoor city water spigot that is connected to the same water line as the rain barrel.

I also have 2 manual PVC shut off ball valves attached to the two water lines so that if I am pulling water from my rain barrel via the transfer pump, I will manually shut off the city water pvc ball valve, and vice versa if I am pulling water from the city water line.

Currently, on the city water spigot attached to my home, I have a vacuum breaker installed, however, after reading more online, I believe another component (i.e. Check Valve / Backflow Preventor) may be needed?

The goal here was that if my rain barrel was low on water, I could manually switch over and use my city water using the same spigot in my garden.

Thanks
 

WorthFlorida

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Never ever connect potable and nonpotable water without a backflow preventer or double check valve. As Boycedrilling suggest you need to call your water department on what they will require.
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