Plumber Red Seal · Question
What is the required minimum trap seal depth for most standard plumbing fixtures?
A trap seal depth of at least 38 mm (1.5 inches) is generally required by the NPC to effectively block sewer gases while being shallow enough to be scoured clea
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Question: What is the required minimum trap seal depth for most standard plumbing fixtures?
Answer options:
- 25 mm (1 inch) ✅ 38 mm (1.5 inches)
- 76 mm (3 inches)
- 100 mm (4 inches)
Correct answer: 38 mm (1.5 inches)
Explanation: A trap seal depth of at least 38 mm (1.5 inches) is generally required by the NPC to effectively block sewer gases while being shallow enough to be scoured clean with normal fixture use.
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