NBOPE Journeyman Plumber Certification Exam

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What is the minimum air gap required between a water supply outlet and the flood level rim of a receiving fixture under most plumbing codes?

One-half inch regardless of pipe size Twice the effective opening of the supply outlet, but not less than 1 inch Three times the pipe diameter 1 inch for all pipe sizes up to 2 inches

Correct Answer:

Twice the effective opening of the supply outlet, but not less than 1 inch

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