What is used to prevent contamination of a potable water system supplying a plumbing fixture such as a galley sink from a backup of sewage sanitary drains?

Question

Accepted Answer

Location of the potable water spigots above the rim of the galley sink.

Answer

Check valves in the potable water supply lines delivering water to the galley sink.

Answer

Location of the potable water spigots below the rim of the galley sink.

Answer

A "P" trap in the drain line draining sewage waste from the galley sink.

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