Each lavatory has how many drain valves?

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Multiple Choice

Each lavatory has how many drain valves?

Explanation:
In aircraft lavatories, the waste must be drained through a dedicated control to keep the system reliable and odors contained. There is one drain valve per lavatory, giving independent control of the waste flow into the waste system. Having more than one would add unnecessary complexity and potential leak paths, while having none would make drainage impossible.

In aircraft lavatories, the waste must be drained through a dedicated control to keep the system reliable and odors contained. There is one drain valve per lavatory, giving independent control of the waste flow into the waste system. Having more than one would add unnecessary complexity and potential leak paths, while having none would make drainage impossible.

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