Plumber Red Seal · Question
Which of these materials is NOT permitted for use in a sanitary drainage system within a building?
While ABS, PVC, and cast iron are approved materials for DWV systems, corrugated interior pipe is not permitted for sanitary drainage because its ridges would t
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Question: Which of these materials is NOT permitted for use in a sanitary drainage system within a building?
Answer options:
- Acrylonitrile-butadiene-styrene (ABS)
- Cast iron
- Polyvinyl chloride (PVC) ✅ Corrugated interior polyethylene pipe
Correct answer: Corrugated interior polyethylene pipe
Explanation: While ABS, PVC, and cast iron are approved materials for DWV systems, corrugated interior pipe is not permitted for sanitary drainage because its ridges would trap solids and cause frequent blockages.
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