Plumber Red Seal · Question
What is the minimum diameter of a trap arm that can receive the discharge from a single residential kitchen sink?
The NPC specifies a minimum trap arm size of 1 1/2 inches for a residential kitchen sink to adequately handle the flow and resist blockages from food waste and
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Question: What is the minimum diameter of a trap arm that can receive the discharge from a single residential kitchen sink?
Answer options:
- 1 1/4 inch ✅ 1 1/2 inch
- 2 inch
- 3 inch
Correct answer: 1 1/2 inch
Explanation: The NPC specifies a minimum trap arm size of 1 1/2 inches for a residential kitchen sink to adequately handle the flow and resist blockages from food waste and grease.
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