Plumber Red Seal · Question
What is the minimum nominal pipe size for a drain serving a single floor-mounted water closet?
The National Plumbing Code specifies that the minimum size for a drain line serving a water closet is 3 inches to ensure it can adequately transport solid waste
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Question: What is the minimum nominal pipe size for a drain serving a single floor-mounted water closet?
Answer options:
- 2 inch
- 2.5 inch ✅ 3 inch
- 4 inch
Correct answer: 3 inch
Explanation: The National Plumbing Code specifies that the minimum size for a drain line serving a water closet is 3 inches to ensure it can adequately transport solid waste and prevent blockages.
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