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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? |
A) Location of the potable water spigots below the rim of the galley sink. |
B) Location of the potable water spigots above the rim of the galley sink. |
C) A "P" trap in the drain line draining sewage waste from the galley sink. |
D) Check valves in the potable water supply lines delivering water to the galley sink. |
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