Question: Question 3 ? The BEST method for preventing backflow is with a / an q , air gap. single - check valve. double - check

Question 3?
The BEST method for preventing backflow is with a/an
q,
air gap.
single-check valve.
double-check valve.
hose attached to the faucet.
 Question 3? The BEST method for preventing backflow is with a/an

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