What is the best way to prevent back-flow from a cross-connection?

Here is the answer for the question – What is the best way to prevent back-flow from a cross-connection?. You’ll find the correct answer below

What is the best way to prevent back-flow from a cross-connection?

The Correct Answer is

An air gap

Reason Explained

An air gap is correct for What is the best way to prevent back-flow from a cross-connection?

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