Plumber Red Seal · Question
A plumber is installing a water closet in a commercial washroom. The rough-in for the main soil stack is 100 mm. What diameter of closet flange should be used to connect the water closet to the drainage system?
A 100 mm water closet requires a 100 mm closet flange to ensure a proper seal and connection to the 100 mm soil stack, as specified by plumbing codes for standa
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Question: A plumber is installing a water closet in a commercial washroom. The rough-in for the main soil stack is 100 mm. What diameter of closet flange should be used to connect the water closet to the drainage system?
Answer options: ✅ 100 mm
- 75 mm
- 125 mm
- 50 mm
Correct answer: 100 mm
Explanation: A 100 mm water closet requires a 100 mm closet flange to ensure a proper seal and connection to the 100 mm soil stack, as specified by plumbing codes for standard water closet installations. Using a smaller flange would restrict flow and violate code.
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