Engine : General Subjects - 1321/1128
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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) Check valves in the potable water supply lines delivering water to the galley sink. |
| C) A "P" trap in the drain line draining sewage waste from the galley sink. |
| D) Location of the potable water spigots above the rim of the galley sink. |
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