Plumbing questions: if the plumbing fixture faucet is below the siphon Line in the sink (over flow) what type of concern would this present?

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Originally Posted by Maintenance Man

Plumbing questions: if the plumbing fixture faucet is below the siphon Line in the sink (over flow) what type of concern would this present?

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Cross contamination of the potable water supply is the concern.

Code requires an airbreak between the outflow of the spout and the top of the sink.