Red Seal Plumbing Practice Exam

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What is the minimum size of wet vent to be installed for a three piece basement plumbing rough-in?

  1. 40mm (1 1/2")

  2. 50mm (2")

  3. 75mm (3")

  4. 100mm (4")

The correct answer is: 50mm (2")

The minimum size of wet vent to be installed for a three piece basement plumbing rough-in is 50mm (2"). A 40mm (1 1/2") vent may not provide enough air flow for proper drainage and a 75mm (3") or 100mm (4") vent would be unnecessary and potentially costly. Therefore, option B is the most appropriate and efficient choice.

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